Did you do your own propane conversion? My portable genny is the ubiquitous PowerStroke 6800 with Honda GX engine, that I see all over, I guess they're pretty popular. But they're gas only from the factory, and the propane conversion kit I found for them back when I bought new involved cutting the frame. Some folks reported issues with that, as it really weakens the thing, with regard to travel if you load it onto a truck or trailer, or tote it around on the back of a tractor.
If anyone knows of a better propane conversion kit, I'd be interested. We have propane in our garage already, feeding a space heater, so it wouldn't be hard to tee in another line on a quick disconnect fitting for feeding the generator when back-feeding the house.
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