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Much better choice than the 6.2 diesel. I had an older MH like this one.It had a 454 BBC with a turbo 400. I did add 2 heavy springs in the rear spring pack. It did help out a lot with towing. The short wheel base, tend to get very light in the front when loaded.
You can bet your fuel mileage will be 7 miles to the gallon. But the comfort out weighs the cost of fuel. Good luck with your purchase!
After all the years towing with a pick up I would never go back to a pick up again. I have towed the last few years with a 2001 Georgie Boy Pursuit 35' on a F 53 chassis with a 6.8 liter v 10. It's up for sale at this time. Going to buy a diesel Holiday Rambler with a 300 HP Cummings