Help-Setting up a trailer for Racing

the Hondas are great generators, quiet but expensive. I take my 6500 watt generator with me but have never used it yet. I purchased a big 900amp fishing battery meant for the electric motors to move your bass boat. I have yet to run it down. they also keep the voltage up high for longer periods of time before they start to discharge. the battery I had before was a high amp racing battery and cost $400 so the fishing battery at $100 is a good deal. the racing battery did last 8 years and was a good investment also. I'm now considering a unit you hook up to the truck and it changes the dc voltage to ac, i'm thinking i'll need a 3000-4000 watt one to run a small air compressor or battery charger. I like the no noise thing and I don't have to load the generator, a couple of +'s