I am looking for a way to make a PC/cart completely wireless (no power or LAN cords). I have found one solution from Ergotron, in the form of their EPS/48 and EPS/100 deep cycle UPS + cart solution. It is a very slick solution, but expensive (around $2,500 for the cart + UPS). I was thinking that if I could find a UPS designed with deep cycling in mind (like the Ergotron EPS line), that was reasonable cost, I could use any old cart. I have not been able to find another UPS manufacturer with deep cycle UPS. Does anyone know of a manufacturer?