In 1986 Toyota came out with the extra long wheel base of 137". The full sized rigs were built on this chassis and the only changes to the frame were behind the rear axle where they added extensions to support the coach. 1985 and older the frames had to be altered to accommodate the full sized rig and there would be visible welds on each side. My friends 1984 was extended so long he has a 142 inch wheel base. I have never seen shoddy frame alterations or weak looking rear extensions on a Sunrader. My rear extensions look stronger than the frame itself. I don't have a 21 footer though so I can't compare the metal crossbeams though. Without being there to look at it there isn't much more I can tell you.
Try putting your vin in here like you were looking for parts. It will tell you the year. Lots of these coaches are dated the year after the truck was built because of the time it make to manufacture the motorhome
Linda, I have a 1988 sunder 21' with the 142" wheelbase. is that the stock wheelbase or did they move the rear axle back? Just trying to get an idea. I have found a 1988 4WD Toyota pickup (Terrible body, solid frame) that i was considering swapping over. Just don't know if it will fit, without measuring the 4wd frame. All the diagrams i have looked at list the wheelbase shorter than that.
'86 Sunrader Chassis Frame Diagram?
in Engines - Transmissions - Drive Train - Suspension - Chassis - Steering - Exhaust - Tires - Etc.
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Linda, I have a 1988 sunder 21' with the 142" wheelbase. is that the stock wheelbase or did they move the rear axle back? Just trying to get an idea. I have found a 1988 4WD Toyota pickup (Terrible body, solid frame) that i was considering swapping over. Just don't know if it will fit, without measuring the 4wd frame. All the diagrams i have looked at list the wheelbase shorter than that.