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.
  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 07-07-2013, 11:50 AM   #1
Junior Member
Join Date: May 2013
Posts: 3
Domani suspension upgrade

We just purchased a 2008 Domani 5er. The numbers suggested that our 2012 2500HD would handle this unit quite easily. Actual numbers proved quite the opposite,so....enter new 3500HD.

After hooking up to the 3500, we find that 5er is now 6" off of level: high in front.
The pin box is up as high as it can go, and the hitch is as low as it can be to maintain the 6" clearance required.

What to do..what to do.

After talking with a suspension repair company, he is strongly recommending that I remove the existing torflex system and put in its place the leaf standard spring setup. (using appropriate weight axles of course).

I am not sure about this move. What do you guys think about this proposal.

Please, all opinions or thoughts appreciated.

golden_eagle 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 07-07-2013, 12:32 PM   #2
Moderator Emeritus
TXiceman's Avatar

Vintage RV Owners Club
Texas Boomers Club
Oklahoma Boomers Club
Ford Super Duty Owner
Join Date: Aug 2000
Location: Full Time, TX Home Base
Posts: 17,169
Blog Entries: 21
The Torquflex is a good suspension system. If you need to raise the trailer a couple of inches, use a 2" x 2" square steel section. Make this about 2' or 3' longer on each end past the axle mounts. Weld this to the original frame and remount the axles. There is no reason to go back to a spring suspension system.


Amateur Radio Operator (KE5DFR)|Full-Time! - 2012 6.7L Ford Crew Cab Dually -2013 HitchHiker Champagne 38RLRSB - Travel with one Standard Schnauzer and one small Timneh African Gray Parrot
TXiceman is offline   Reply With Quote
Old 07-07-2013, 01:34 PM   #3
Senior Member
Join Date: May 2001
Location: Spicewood, Tx
Posts: 655
Originally Posted by TXiceman View Post
The Torquflex is a good suspension system. If you need to raise the trailer a couple of inches, use a 2" x 2" square steel section. Make this about 2' or 3' longer on each end past the axle mounts. Weld this to the original frame and remount the axles. There is no reason to go back to a spring suspension system.

Agree 100%, there is no way a leaf spring suspension will ride as good as the Torquflex. And the conversion he is recommending with new axles will cost more than just adding a subframe as TXiceman suggested. Finally, a leaf spring setup does not provide the added cross bracing between the main frame rails that the existing axles provide, so what warranty would the installer provide against frame rail 'roll'?
Larry Day, Texas Baptist Men volunteer
'13 Silverado LT 3500HD D/A CCSB 2wd, custom RKI bed
'17 Puma 351THSS toyhauler
dayle1 is offline   Reply With Quote
Old 07-07-2013, 02:10 PM   #4
Senior Member
Join Date: Dec 2012
Posts: 2,722
I agree with everyone else. The cost for the axles, leaf springs and all hardware may be a little cheaper than having the existing suspension raised. The torsion suspension is way better. Sounds like you need a 6" lift on the 5'er. Probably need a 2"x6" rectangle tubing subframe welded to your existing frame. Spendy but it would keep the integrity of the stock suspension. Another alternative is to lower the rear of the truck by removing the spacer blocks between the springs and the axle. Then install some air bags to re-level the rear after hooking up. You would at least gain around 2" that way.
Cumminsfan is offline   Reply With Quote
Old 07-07-2013, 02:17 PM   #5
Senior Member
hjsdds's Avatar
Join Date: Apr 2013
Posts: 330
Riding that high off level will not be good on the tires on the fifth's rear axle, they will be taking most of the weight.
The pin boxes can be modified (sometimes) by drilling more matching holes in the king pin sleeve and pushing it further in. If there is an interference at the top of the sleeve then a portion of it can be (plasma) cut off.
I don't think it's a solution in your situation since you are already close to the truck bed sidewalls, so you have to raise the fifth. If you are off level by 6" unfortunately it means it will have to go up by 6", it doesn't matter what your wheelbase is from the pin to the center of the axles. That's a lot. 4" is more typical in those situations, you might have to do a combination of the pinbox mod and axle mod. Good competent frame shop (don't go to a dealer, they'll just send it out and skin you alive) should be able to do it. Depending what the Domani frame is a section square or rectangular tubing could be welded in the area where the axles are and axles re-attached below that added tubing. Being square to the frame and to each other (axle) is very important here. Torqueflex suspension is indeed a good suspension in a dual axle setup, but it's also very finicky when it comes to installation, Dexter has a whole bunch of pages on how to "properly" install those, this might be a reason why the suspension company wants to switch to a conventional spring setup. I would not be too "disappointed" with a spring axles, these have been around for a long time and they work very well. I would guess that the shop wants to do what is known as an "axle flip", I had it done on my fifth to go from a very low setup with a pickup (19 inch tires),

to pulling with a semi (22 inch tires).

You can see in the second picture that the tires on the fifth are not as deep into the well (4 inches lower). What the "axle flip" does it mounts the springs " overslung" vs. "underslung" you might want to discuss this terminology with the suspension company. There are two issues with doing this, the tires will be lower in the well and I don't know how funky it might look on a Domani, maybe not funky at all. It certainly didn't make any difference (in the "look") on my rig (16 inch fifth tires). Second your rig will be higher and the steps might not work as well. On mine I solved the problem with an "accessory step",

which we add to the steps every time we set up. Pretty cheap from the RV parts supplier.

hjsdds is offline   Reply With Quote
Old 07-07-2013, 08:18 PM   #6
Senior Member
Franka548's Avatar
Freightliner Owners Club
Retired Fire Service RVer's
Join Date: Apr 2011
Location: N E Ohio
Posts: 3,605
golden eagle,
I had the same problem, I put on the airlift road tamer air ride suspension system on my pickup and set the ride height to about 5" lower than stock, now 5er rides less than an inch from level and the truck rides level. The only thing I had to adjust on the truck was the headlights, with the rear lower the headlights were aimed too high, turned them down and everything is good. Airlift no longer makes this setup, but there are 2 or 3 other manufacturers that do. Price runs between 2500 and 3500.

05 Alfa Gold 40' Motor Home "Goldie" 03 Malibu Toad towing 4 down
03 Silverado cclb 3500 drw, D/A, Reese 22k hitch
07 Alfa SeeYa Gold 30RL,2 slides,power everything Above for sale PM me for details
Franka548 is offline   Reply With Quote


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

» Featured Campgrounds

Reviews provided by

Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 07:26 PM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2018, vBulletin Solutions, Inc.