Hi,
I know someone who had a class C Ford with a diesel engine in it, and upgraded to a FRED (Front Engine Diesel) class A motorhome. It has a large straight 6, not sure if it is a 5.9L or the larger 8.3L, but in the 300 HP range it might have been either engine. The 8.3L is pretty quiet just because at 2,400 RPM it would be way past it's governor, and they just have tons of torque, but not much HP after 2,000 RPM, so they run low speed.
Test drive a couple before making a decision. One built on the International chassis, the owner complained about it ridding like a lumber wagon, not the softer ride of a air ride DP. I have ridden in the back of a class 6 delivery truck while picking up a hot air balloon, bouncing across a grass field. It was not a 'lot' of fun. . .
Check the rear area, and see how solid it feels while someone else is driving!
Good luck,
Fred.
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