No Juice

After thinking about it all afternoon, I went out this morning to do some more trouble shooting. I did find that the GFI outlet in the bathroom shuts off everything. It was tripped, I reset it, had power for a few seconds and it tripped again. So I started checking for loose connections. GFI's in kitchen and bathroom were all wired tight, wiring in breaker box was tight, all fuses were good, wiring from converter to breaker box was tight and wiring from surge protector to converter was tight. Checked the battery cables and connections and fuses in the front compartment, no problems. So far I can't find the problem but I am leaning toward a short or loose wire somewhere.
I need to get the slides out to see if there is another GFI outlet somewhere. Beyond that I am somewhat at a loss short of checking wiring to all outlets and fixtures. I was planning on getting a larger amp converter and I am still going to do that. But I don't know if that will help my current situation.