Are you comparing an old vehicle engine, powering a heavy load at slow RPM? In that case, insufficient air is drawn through the radiator as the engine is worked hard; a belt-driven fan blade is too slow.
Your new generator is designed to work fine as long as you don't overload it and ambient...
If it uses lubricating oil, consider synthetic for less friction/heat. Make sure there's nothing nearby blocking air/heat flow. Lower output means lower efficiency but less heat. To monitor, remote thermometers are ~$20 in home/garden stores. You'll want to check the temp of the round case of...
If you just want to use the tripod, drill a hole off-center (try different spots) in a strip of metal or plastic and bolt it down. Hang the camera off to one side using the materials I just mentioned (above). Shake-free cam may still be your best bet.
I used to buy Sorbothane as running shoe inserts (~US $20/pair). Personally, I think it's far too dense for your needs - you've got long, bass audio vibes, not high-freq micro-vibes.
I'd hang two or more uneven-length rubber bands/belts from a floor-based frame made of uneven lengths of EMT...