Have 5.5kva propane in the MH. No issues so far. The only advantage that I can see is cleaner burning. However, fuel burn is a little higher due to the higher efficiency of a diesel generator. Would convert to diesel if I had to replace the unit? I don't know. We don't often use the generator due to camp grounds having full hook ups. For dry camping I think the general opinion is diesel is the better way to go again due to fuel burn per hour.
1998 Rexhall Anthem 34' DP, Cummins ISB, Allison 5 speed, Spartan Chassis, 300 watts solar.