Zoso, I have two Trojans T-145 6-volt batteries but was debating when I bought them because of the price. I think well of US Battery, too, and had been considering the US Battery US145xc. In the end, both are very good companies. I choose the Trojans because of the beefier plates (holds a charge longer and should last longer).
But, like I said, I would have been happy with the US Batteries as well.
Make sure you buy a good charger. Most chargers built into a trailer's converter (e.g., WFCO) don't provide the high voltage these need in bulk mode to stay healthy. Its fine to charge via the converter while camping, but then throw it on the good charger before storage.
DW, 3 Kids and our Goldens
2012 Shamrock 233S
2008 Toyota Sequoia 5.7L 4WD