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Old 07-17-2016, 09:51 PM   #1
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Which F53 chassis extension would you choose...?

... to support a lot of weight in the back. I'm thinking hot tub! Well, no, not really. But I'm thinking the full 500 pounds of tongue weight with a motorcycle and carrier, not a trailer. The pictures attached show two different frame rail extensions. The first one is a 22K F53 chassis with a full butt weld with plates welded on each side. This one also has a cross member welded between the two welded on extensions prior to the receiver. The other is a 24K F53 chassis with what I call a partial butt weld as the c-channel attached is larger than the f53 frame rails. This one has one plate welded on and a box section of material joining the two bottom edges of each c channel. This one doesn't have a welded on cross member prior to the class iv receiver. I'm not going to identify the two coaches, but they are current 2016 models.

I'm no judge of what's good, what's better and hope to get educated by the IRV2 membership!

Thanks,
DF
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Old 07-17-2016, 11:50 PM   #2
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Have you weighed the RV to see if you have that much load capacity available? Adding extensions to frame extensions, with the usual long overhang of the front engine chassis is really going to stress whatever you put 8' or more behind the rear axle.
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Old 07-17-2016, 11:56 PM   #3
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Which f53 chassis extension would you choose...

How much are you adding to the overhang? What's the final overhang distance? Will the front wheels remain on the ground? If you end up with a 12 ft overhang that will put 6000 ft/Lb onto the rear axle, without even considering G-forces from bumpy or uneven roads. Why?


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Old 07-18-2016, 01:17 AM   #4
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Personally, I would not hang a 500# motorcycle plus the lieft or mount on the back of a gasa powered motorhome chassis.

Think of a see-saw. You hand 500# on one end and it unloads the other ens.

Going light on the steer tires is not a pleasant thing to drive.

Ken
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Old 07-18-2016, 02:01 AM   #5
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They make trailers just for that reason.
Why don't you look into a front carry for the motorcycle. You may have enough leftover weight on the front axle to support it.

There are also Tow haulers out there that you can just put your motorcycle into. Thor Outlaw Class A; Newmar Canyon Star and maybe a few others.
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Old 07-18-2016, 08:32 AM   #6
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I haven't seen a gasser with a lift on it for that reason. I seriously doubt it can carry the load properly and within limits
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Old 07-18-2016, 07:46 PM   #7
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Thank you

I appreciate everyone's perspective on how to bring my motorcycle with me or the things to consider when using a carrier. There are various reasons why I'm considering using a carrier instead of a trailer. First and foremost, after buying the motorhome (still choosing), I would then have to buy a trailer. Then find a place to store the RV and trailer. I'm not fortunate enough to own a home with RV parking. Also, a toy hauler is not an option as most of my trips will be with toad, not motorcycle. I've got to keep the DW happy.

I'm also NOT planning on using a lift, those weigh a ton (figuratively speaking).

I promise everyone I'll get the unit weighed, make sure there's enough capacity, and not drive it if there's less than Ford's recommended front axle load percentage or if I have overloaded either axle or the GVWR.

I get the feeling that some of you may not consider putting 500 lbs of tongue weight into the receiver, regardless of its source, to be a reasonable thing to do. Does it matter if it's 500 lbs of trailer tongue weight or 500 pounds of motorcycle + carrier? Doesn't it result in nearly the same rear axle loading? Doesn't adding weight in front of the rear axle offset some of the weight behind the axle? Full water vs. 10% water, for example? FWIW, the center line of the motorcycle would be approximately 20" from the receiver. And one of the the coaches I'm considering has a whopping 4500 lbs of OCCC so I may have some wiggle room.

What I'm really interested in is an assessment of the chassis extensions used by the two manufacturers of the motorhomes I'm considering. Do you believe one or the other would better handle 500 lbs of tongue weight, regardless of the source of the weight?
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Old 07-18-2016, 07:56 PM   #8
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I really don't have an opinion on the frame extensions, what are the receiver ratings for both RVs? If the receiver is rated for 500 pounds, factor in the weight of the platform and motorcycle, and remember it will be bouncing at the end of the lever, with the fulcrum being the rear axle. The actual forces of that weight so far back from the fulcrum is what you have to worry about.
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Old 07-18-2016, 09:15 PM   #9
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Go to pirate4x4.com and ask ... All they do is custom fab work.. Probably get some good educated opinions.
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Old 07-18-2016, 10:30 PM   #10
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Quote:
Originally Posted by DodgersFan View Post
I appreciate everyone's perspective on how to bring my motorcycle with me or the things to consider when using a carrier. There are various reasons why I'm considering using a carrier instead of a trailer. First and foremost, after buying the motorhome (still choosing), I would then have to buy a trailer. Then find a place to store the RV and trailer. I'm not fortunate enough to own a home with RV parking. Also, a toy hauler is not an option as most of my trips will be with toad, not motorcycle. I've got to keep the DW happy.

I'm also NOT planning on using a lift, those weigh a ton (figuratively speaking).

I promise everyone I'll get the unit weighed, make sure there's enough capacity, and not drive it if there's less than Ford's recommended front axle load percentage or if I have overloaded either axle or the GVWR.

I get the feeling that some of you may not consider putting 500 lbs of tongue weight into the receiver, regardless of its source, to be a reasonable thing to do. Does it matter if it's 500 lbs of trailer tongue weight or 500 pounds of motorcycle + carrier? Doesn't it result in nearly the same rear axle loading? Doesn't adding weight in front of the rear axle offset some of the weight behind the axle? Full water vs. 10% water, for example? FWIW, the center line of the motorcycle would be approximately 20" from the receiver. And one of the the coaches I'm considering has a whopping 4500 lbs of OCCC so I may have some wiggle room.

What I'm really interested in is an assessment of the chassis extensions used by the two manufacturers of the motorhomes I'm considering. Do you believe one or the other would better handle 500 lbs of tongue weight, regardless of the source of the weight?
I did this with my P30 Adventurer, welded up some support steel to the frame and made a rack to carry my KTM and my sons small Honda. Rack and 2 bikes probably weighed close to 500lbs, never weighed it but I had air bag suspension and just put in some air and it never affected the way it drove. I also had a tongue extension so I could pull my Jeep with the bikes on the back, always worked great. Most likely way over weight limit but it did not feel like it. That coach had far worse issues like brakes to worry about other than my bike carrier.
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