Go Back   iRV2 Forums > TRAVEL TRAILER, 5th WHEEL & TRUCK CAMPER FORUMS > 5th Wheel Discussion
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
 
Thread Tools Search this Thread Display Modes
 
Old 08-13-2014, 08:47 AM   #1
Senior Member
 
Big-Foot's Avatar
 
Join Date: May 2014
Location: Kenyon, MN
Posts: 263
Arrow Upgrading Axels, Wheels, Suspension & tires

Hi gang,
Well I've read until I was cross-eyed many nights here and still have a bunch of questions that I have not been successful in answering via the search..

We're looking at an apparent orphan fifth wheel toyhauler (yes, I have been to the toyhauler section - but this is relevant to all fifth wheels - please bear with me..)... It's a triple axle mid-2000 McKenzie Dune Chaser.

The place that has it tells me that it has 5050# axels (yes, the numbers are right) and 225/75R15 Load Range D tires.

I like the rig itself and I am told that McKenzie made quality units (would like to hear your take on that) but I am suspect of the Axel and tire loading and would like to figure out what my alternatives are with this.

Upgrading Axles to 6-7,000#
Upgrading springs to match axel capacity (if necessary)
Upgrading from 15" to 16" wheels and tires

There appears to be enough room between the tires to support tires that were 1" to 1-1/2" larger in diameter and still have a couple inches to spare. The bodywork on the coach also looks to have sufficient clearance.

I've only found 1 15" load range E tire out there that is the same size as the original and it has some pretty bad reviews as being a member of the China-Tire bomb family..

I'm not looking to carry more weight than the factory rated maximums, but I am looking for a wider comfort zone between that maximum capacity and the rated capacity of the axles and tires..

I am an accomplished fabricator and have my own welders and machine-shop tools, so doing the work to install is sweat only on my brow. As you can probably guess, I am biased toward the "overkill" side..

Has anyone done an upgrade such as this?
Any help and pointers are appreciated..

Thank you...
__________________

__________________
Regards - Randy & Dar
2015 F350 CrewCab DRW 6.7/409 PSD - 2008 Rage'n Stryker 4005 fifth-wheel Toy Hauler - 2014 Arctic Cat Wildcat Trail-XT SxS just-4-grins
Big-Foot is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 08-13-2014, 07:45 PM   #2
Senior Member
 
Kurmudgeon's Avatar
 
Monaco Owners Club
Vintage RV Owners Club
Holiday Rambler Owners Club
Join Date: Mar 2008
Location: Klamath County, Oregon
Posts: 245
Never heard of McKenzie trailers, so I can't comment on that. But I am a big fan of 16 inch tires. You will have a whole lot more choices in size and load range in 16s. Even if you're using the heaviest duty 15, you may have trouble finding a replacement on short notice.

When it comes to overkill, you and I are in the same club. I have 17 trailers of various types and sizes, and I spend a lot of time towing. I always use tires that are rated significantly above what they will be carrying. I've been told more than once that I don't NEED such a heavy tire. Well, I have NEVER had a tire failure on the road.

The only tire failure I've ever had was a U.S. made Goodyear Marathon that literally came apart while the trailer was parked. It hadn't moved in at least 6 months. So much for the highly rated GY Marathons.
Attached Thumbnails
Click image for larger version

Name:	GY Marathon.jpg
Views:	100
Size:	182.2 KB
ID:	70729  
__________________

__________________
Jim Price
curmudgeon: noun; a crusty, ill-tempered, irascible, cantankerous old person . . . .
79 27' Holiday Rambler Statesman, 78 32' HR Imperial, 85 36' HR Imperial 5th Wheel
Kurmudgeon is offline   Reply With Quote
Old 08-13-2014, 08:00 PM   #3
Senior Member
 
Gordon Dewald's Avatar
 
Winnebago Owners Club
Join Date: Mar 2014
Posts: 10,164
Dont overdo the springs too much. Even with a triple axle the back end of the trailer will be very rough and will fling your toys around. I was told to keep the axles and springs near the maximum load you are expecting to carry otherwise it will be more likely to bounce. Best thing is to replace the springs with torsion axles if you can. They ride way smoother.
__________________
Gordon and Janet
Tour 42QD/inTech Stacker
Gordon Dewald is online now   Reply With Quote
Old 08-13-2014, 09:46 PM   #4
Senior Member
 
wingnut60's Avatar
 
Join Date: Aug 2004
Location: Wherever the Suites is
Posts: 2,982
15k available axle rating may be plenty--the axles only see the actual weight less the pin weight. You definitely need to upsize to 16" tires/wheels.
What is the GVWR on the trailer?
Joe
__________________
'15 38RSSA Mobile Suites
'05 36TK3 Mobile Suites--retired but not forgotten
'17 F450--trying one more Ford
'09 F450--died, replaced with '10--retired
wingnut60 is offline   Reply With Quote
Old 08-13-2014, 09:47 PM   #5
Senior Member
 
Big-Foot's Avatar
 
Join Date: May 2014
Location: Kenyon, MN
Posts: 263
Quote:
Originally Posted by Kurmudgeon View Post
Never heard of McKenzie trailers, so I can't comment on that. But I am a big fan of 16 inch tires. You will have a whole lot more choices in size and load range in 16s. Even if you're using the heaviest duty 15, you may have trouble finding a replacement on short notice.

When it comes to overkill, you and I are in the same club. I have 17 trailers of various types and sizes, and I spend a lot of time towing. I always use tires that are rated significantly above what they will be carrying. I've been told more than once that I don't NEED such a heavy tire. Well, I have NEVER had a tire failure on the road.

The only tire failure I've ever had was a U.S. made Goodyear Marathon that literally came apart while the trailer was parked. It hadn't moved in at least 6 months. So much for the highly rated GY Marathons.
Here's the last Goodyear Marathon that went on me... Luckily it did not blow while I reached in with a valve core remover.. I have more pictures than this, but you get the idea.. BTW, these tires were only about 6 months old..





Quote:
Originally Posted by Gordon Dewald View Post
Dont overdo the springs too much. Even with a triple axle the back end of the trailer will be very rough and will fling your toys around. I was told to keep the axles and springs near the maximum load you are expecting to carry otherwise it will be more likely to bounce. Best thing is to replace the springs with torsion axles if you can. They ride way smoother.
Hello again Gordon...
I like torsion axles too, but to replace leaf springs with them, it's going to take a fair amount of structural work as the entire load of a torsion axle is located all within about 10" of frame where the torsion tube bolts into the frame. Plus, the trailer would sit much lower unless I welded up a dropped carriage to bolt the axles to.



What about wheels? Aluminum vs. steel certainly the alloys look better, but at a substantial price delta. The steel wheels I have seen have relatively flat disc centers. Would there be any concern about side loading and these wheels not being up to the task?

Tires.. So I'm pretty certain that I won't be using ST's but LT's..

Is there any chart that will get me tires that are maybe 1 to 1-1/2" larger in diameter than ST225/75R15?

Would love to hear from folks that have already done this themselves..

Thanks
__________________
Regards - Randy & Dar
2015 F350 CrewCab DRW 6.7/409 PSD - 2008 Rage'n Stryker 4005 fifth-wheel Toy Hauler - 2014 Arctic Cat Wildcat Trail-XT SxS just-4-grins
Big-Foot is offline   Reply With Quote
Old 08-13-2014, 09:51 PM   #6
Senior Member
 
Big-Foot's Avatar
 
Join Date: May 2014
Location: Kenyon, MN
Posts: 263
Quote:
Originally Posted by wingnut60 View Post
15k available axle rating may be plenty--the axles only see the actual weight less the pin weight. You definitely need to upsize to 16" tires/wheels.
What is the GVWR on the trailer?
Joe
Hi Joe,
This is what I have on it:
According to the advertised weights on this rig, it can have a GVWR of 16,950 and 2,910 on the hitch.
This leaves 14,040 on the tires.
__________________
Regards - Randy & Dar
2015 F350 CrewCab DRW 6.7/409 PSD - 2008 Rage'n Stryker 4005 fifth-wheel Toy Hauler - 2014 Arctic Cat Wildcat Trail-XT SxS just-4-grins
Big-Foot is offline   Reply With Quote
Old 08-13-2014, 11:22 PM   #7
Senior Member
 
Kurmudgeon's Avatar
 
Monaco Owners Club
Vintage RV Owners Club
Holiday Rambler Owners Club
Join Date: Mar 2008
Location: Klamath County, Oregon
Posts: 245
Quote:
Originally Posted by Big-Foot View Post
Is there any chart that will get me tires that are maybe 1 to 1-1/2" larger in diameter than ST225/75R15?
This should tell you what you want to know. A 225/75R16 would give you an inch.

http://www.tirerack.com/tires/tirete....jsp?techid=53






--
__________________
Jim Price
curmudgeon: noun; a crusty, ill-tempered, irascible, cantankerous old person . . . .
79 27' Holiday Rambler Statesman, 78 32' HR Imperial, 85 36' HR Imperial 5th Wheel
Kurmudgeon is offline   Reply With Quote
Old 08-14-2014, 06:04 AM   #8
Senior Member
 
Big-Foot's Avatar
 
Join Date: May 2014
Location: Kenyon, MN
Posts: 263
Quote:
Originally Posted by Kurmudgeon View Post
This should tell you what you want to know. A 225/75R16 would give you an inch.

http://www.tirerack.com/tires/tirete....jsp?techid=53
--
*PERFECT*

Thanks Jim!
__________________

__________________
Regards - Randy & Dar
2015 F350 CrewCab DRW 6.7/409 PSD - 2008 Rage'n Stryker 4005 fifth-wheel Toy Hauler - 2014 Arctic Cat Wildcat Trail-XT SxS just-4-grins
Big-Foot is offline   Reply With Quote
Reply

Tags
suspension, tires



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Anyone running Samson GL283A tires?? 70gsconvt Class A Motorhome Discussions 28 08-15-2014 07:55 PM
19.5" Truck Wheels and Tires drfife Trailer Towing and Tow Vehicles Discussion 19 08-14-2014 07:09 AM
Your Opinion On Tires friendshipg8 iRV2.com General Discussion 4 08-08-2014 09:23 PM
04 Alfa Suspension Question APlusParts Freightliner Motorhome Chassis Forum 5 05-28-2014 06:11 AM
Yokohama Tires? Cooperhawk Winnebago Industries Owner's Forum 4 04-27-2014 06:57 PM

» Virginia Campgrounds

Reviews provided by


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 11:36 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.