I actually use UPS's extensively, I have them at home on everything and manage hundreds of them at work. However I really do not like the idea of using them in the trailer. In my opinion there are more negatives than positives:
1) they are very heavy and I do not want to overload the trailer
2) they are big and difficult to mount/stow etc.
3) when you are off shore power but still plugged in with an inverter they will draw a load to stay charged. Charging a battery from a battery is not efficient
4) when you are off shore power and forget to turn it off (which could be frequently) the battery will drain and UPS batteries are like car batteries, they are not meant to fully discharge. My experience is a new UPS can only tolerate a couple of full discharges and than it is landfill. An old UPS will be dead after a single full discharge
5) they are really noisy. It drives me nuts when I am in a LAN Room and all I hear is a dozen of them beeping no stop... drives me completely bonkers. The idea of hearing that beep every time there is a brown out, black out, I forget to turn it off before pulling shore power etc. would make me want to throw it out the window.
