Electric motor for trailer jacks or power converter? Help

I'm trying to find out what I have to do in order to fix this power issue. When I last parked my trailer I plugged it into a 50 amp shore power source. Then while trying to raise the power jacks in order to unhook the truck, the switch wouldn't work. It was like there was no power at the switch. So I clicked the battery power switch on in order to use the battery power. It worked fine but after raising the trailer I noticed and smelled smoke. It was like a burning electrical smell. I opened the door for the garage and it was full of smoke. After the smoke cleared I'm pretty sure the smoke was coming from the electric motor that raises and lowers the power jacks.

After this I started looking into the problem further and noticed one of the electric breaks that controls the power converter was tripped off and it would not stay reset. Then I unplugged from the 50 amp and with the plugin adapter plugged into 30 amp shore power. That seemed to fix everything and I've been running it that way since (about 3 weeks). I have the trailer for sale and don't want to sell it without fixing this issue. Please point me in the right direction. I don't want to call an RV repair dealer because I've been ripped off by them before.

Thanking you in advance,
Gary

Here's a link to more info on the trailer.
http://www.gsmxs.com/photos/trailer-for-sale-2