Looks like an interesting unit. With the 4000, it should handle your a/c without a problem but, if you plan on towing anything behind you, you won't be able to do it. It hangs off the rear hitch and I don't see any provision for an extension beyond that. Also consider you have to store the fuel container separately; it doesn't have it's own self-contained fuel source. The ability to transfer it from one unit to another with the "landing gear" may be useful to some people with multiple rigs, but I don't see that as very practical. Also consider that there may be times when you're hooked up to shore power but, for some reason need to run off the genset (power outage, etc.) I would rather have a permanently installed genset, hooked up to the main fuel tank, and a transfer switch which would allow me to change from shore power to the genset without having to switch the power cord, attach the fuel tank, etc.