Welcome to the forum. Most trucks will need to have the frame modified to match the wheel base of the coach being built. Many builders rely on frame shops to do the work for them, a few including IpHawk do it in house. Frames can be lengthened or shortened both before or after the axels. For smaller conversions one of the rear Axles can be removed.
Hawk engineering is a smaller shop and will build on pretty much any chassis. Showhauler is larger and sells through a dealer network and will also build on a used chassis. Both will also build a shell so you can finish the interior yourself if desired. I have also heard NRC builds a quality rig.
We toured a bunch of factories and all the builders are happy to show you around.
Dave
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