If you would have done your homework prior to purchasing this motorhome, you would have saved yourself the 25k loss.
The technical data for the Ford chassis can be found very easily, and the weight of this motorhome is also a known fact. A little math would have shown you that the chassis was at it's limit. The "screaming" of the engine is part of it's design, it is designed to be a high reving engine. It is very powerful, but it makes it's power by means of higher RPM.
Your new DP may be as noisy (it is a fact that diesel engines are way noisier than gas engines), but you don't hear it that well because it sits way in the back underneath your bed. The DP's have their own problems, which are cooling problems, and extremely high maintenance and repair costs (I can tell you something about these costs, I own a truck with a 7.3 liter diesel engine).
But again, if you would have done your homework......
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