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Old 08-21-2013, 06:52 AM   #1
Junior Member
Join Date: Jul 2013
Location: Longmont
Posts: 18
Motorcycle lift design and control

I need to get my 500lb scooter to my campsite using my 1989 Class c 27 foot HR Aluma-lite with a tag axel.

What do you think about a lift on the rear to carry the bike? I could easily design and attach and build this system. But I am a Mechanical Engineer with fabrication skills not an automobile engineer.

But i am worried about reducing the weight on the front end of the coach.

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Old 08-21-2013, 07:32 AM   #2
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Join Date: Jun 2009
Posts: 4,031
You are probably already at the rear GAWR limit. A good reason it has a tag.

For Rear Lifts have your front & rear axle weighted when loaded for travel. Then you can add on the extra weight of a lift by below.

Measure the distance from the center of rear axle to the center of the weight(Lift)
Divide that number by the RV’s wheelbase.
Multiply the result by 100 to get percent.
That percent of the load is added to the load and becomes the total load added to the rear axle.
That percent of the load is subtracted from the front axle weight and unloads the front axle by that amount.

800 lb bike, Lift 100 lb=900 lb
Center axle to rear 120” wheelbase 240”
120 divide by 240=0.50 X 100= 50%
Weight is 1350 lb added to rear axle
Front axle will be 450 lbs lighter

99 Discovery 34Q ISB
2014 MKS AWD EcoBoost Toad
Fulltime Since "99"
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Old 08-21-2013, 09:11 AM   #3
Join Date: Sep 2012
Posts: 76
The lift makers say their lifts are for full frame Class A chassis..........three reasons:

Rear axle weight limits
Added weight in the rear makes front light causing poor handling of already poor handling chassis.
Rear frame structure on class C is usually and add on extension some not strong enough to carry the load.

SOLUTION: Small trailer
2008 Sprinter chassis with
2010 Four Winds House class C
Pulling a 6x12 enclosed trailer
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Old 08-21-2013, 07:28 PM   #4
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Join Date: Jul 2013
Location: Longmont
Posts: 18
OK I am seeing the loads placed on the motorhome could cause negative effects on the system.

What do you think about those one wheel 4 by 8 trailers?

These look as this system heavily loads the wheel with very little load n the pilling unit.

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