I don't have the slightest problem running the 13 ft slide in our 5er with just the Parallax 7355 converter (single 13.8v) and no battery at all, as long as I do the vice grips trick to complete the paths
The Lippert slide out on ours specifies and has a 30 amp fuse on the pos wire. Highest draw is about 25 amps going over the hump at the edge of the floor so it ends up level all across when out. No sweat for a 55 amp converter.
There is nothing magical about our 5er, so I don't see why others can't do it.
EDIT I just did it again. The 25 amps seen on the Trimetric is with battery only on the job. With no battery the Tri shows no amps like that, but the voltage drops from 13.7 to 13.4/13.3 when the slide is running on converter only.
I am on a 50ft #14 extension cord from the house to the shore power cable, which can make a difference to the amount of 120v to the converter--not measured during that test--, but it would be in the lower range.
