We bought a better Inverter for the Trailer than the Coleman 3K unit, not a True-Sine, I did fix my Trace DR 2412 today, but it is a Modified sine, did a great job here at the house when I had it as emergency power. I think it has some sort of electronic 'noise' limiter, because the TV and everything worked well with it.
We figured we would get a new Inverter that will be powerful as we went to the 6 batteries. This is a Magnum, (A brand started by the engineers that designed the Trace. Trace was bought out by Xantrex, Xantrex was bought out by Snyder Electric.) I got a Magnum 2812, a 2800 Watt Pure sine model. We also got the Remote to go with it.
Beans and Franks for the Ozz household for the next 6 months.
http://www.donrowe.com/inverters/ms_series.html
Remote
Magnum 2812