If you are running a couple of gc-2 6v batteries on the tongue, that's around 225 Amp hours. If you can fit a couple of Trojan T1275's on the front of the tongue, at 82 #'s each, now you are looking at 300 Ah.
I just don't have any idea what you can run for watts, inverter wise off of that kind of amperage. Not much. Maybe a sat dish and TV, and a laptop and a coffee maker, versus using the stove and French Press coffee?
While I will be running at most a couple of T1275's, I keep my usage down to about 30 maybe 40 or 50 amp hours. 120 to 160 watts of portable panel works satisfactorily for me, spring through fall.
I have to supplement with a honda generator and a Progressive Dynamics 9245 with Charge Wizard in Bulk charge mode for an hour in the morning in January, when the day light is short and the sun is low on the horizon.
What do you need a 3000 watt inverter for on a travel trailer? Size of the batteries on the tongue of the trailer will /could be the limiting factor.
