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Old 01-06-2006, 03:31 AM   #1
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We have our eye on the Itasca Cambria 26A for our next rig. My question, with comment, is this: Winnebago/Itasca advertise their 3 model lengths (for the Aspect/Cambria) with wheelbases of 158, 182 & 220 inches.
Ford advertises the wheelbase for the E 450 Super Duty Cutaway Chassis for Class C motorhomes as being 138, 158 & 176 inches.
How does any Class C manufacturer accomplish stretching the wheelbase ? Does Ford custom build this chassis (?)- it doesn't seem likely. Increasing LOA is one thing but the wheelbase ??
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Old 01-06-2006, 03:31 AM   #2
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We have our eye on the Itasca Cambria 26A for our next rig. My question, with comment, is this: Winnebago/Itasca advertise their 3 model lengths (for the Aspect/Cambria) with wheelbases of 158, 182 & 220 inches.
Ford advertises the wheelbase for the E 450 Super Duty Cutaway Chassis for Class C motorhomes as being 138, 158 & 176 inches.
How does any Class C manufacturer accomplish stretching the wheelbase ? Does Ford custom build this chassis (?)- it doesn't seem likely. Increasing LOA is one thing but the wheelbase ??
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Old 01-06-2006, 04:32 AM   #3
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Many motorhomes, both Class A and C require chassis/wheelbases different than the standard lengths that Ford or Workhorse produce. This is accomplished by the process of frame stretching.

Stretching is accomplished by cutting and splicing the frame in several locations. Typically on a class C, there will be two frame modivications. The first is in the rear where the overhand is extended by adding length to the rear of the frame behind the rear axle. The other, more difficult stretch is in lengthening in the wheelbase. Lengthening the wheelbase is more than just cutting the frame, but all items running from the front to the rear of the frame must be lengthend as well.

Many of the manufacturers know the frames will be lengthened, and so leave some excess length in wire harnesses, fuel lines, etc. but at a minimum, the drive shaft needs lengthed, usually brake lines and exhaust.

The actual frame cutting and lengthening if done properly should be as strong or stronger than the original frame.

Years ago, when I installed a MorRyde suspension on our Class C, I spent some time on the phone with a MorRyde engineer about their systems. I also found out they did frame stretches for many RV manufactures in Elkhart. The process they use actually doubles up the frame members for a distance about 1 and 1/2 times the length of the stretch.

Check our the MorRyde Frame Services Webpage for more information. They have a interactive graphic showing a typical stretching on a Class A chassis.
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Old 01-06-2006, 07:17 AM   #4
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Thanks for your quick response Joe and as always very informative.
Our 1st mh was a class C. Never gave thought to the chassis. Ignorance is bliss.
Second was an Itasca Sunrise 32v on a P32 - standard 208" w/b. Chassis length became an issue - LOA to w/b ratio etc.
Current mh a class B - once again not much thought given to chassis - no need.
Now that we are looking in the 26' range class Cs - I am paying attention to wheelbase specs, thus the inquiry.
Thanks again Joe and have a great weekend!
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