It appears you are correct about the slanted vs straight windows. The 8V92 is a very good engine, assuming it has been maintained and hasn't been allowed to run hot. Parts are still available and the Detroit Diesel service locations seem to be able to work on them with no problem. As with any engine that has been out of production for over 10 years, I am certain that parts will at some point get to be more difficult to find but there are a LOT of 8V92's running up and down the highways in motorhomes and trucks and many still pushing boats through the water.
The 8V92 provides significant power for a 38' motorhome. Fuel economy differs with driving habits but you should be able to get 6+ mph out of an 8V92 in a 38'. I average 6 mpg in my 43.5' and I tend to drive near 70 on the interstates where it is legal and I run the generator most of the time during the warmer months.
Not sure what the carrying capacity would be on a single rear axle Newell of that vintage. Hopefully an owner of a Newell of similar vintage and size will chime in. Those with tag axles (typically 40+') had relatively high carrying capacities. There is so much customization in Newells that it is difficult to make any blanket statements regarding weight distribution front to rear. Generally pre-slide-out Newells had spare capacity on the front axle. By the early 1990's the front axle carrying weight was tire limited rather than axle or brake limited.
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