If you need ANYTHING for ANY size trailer/camper/hauler etc. you should check out http://redneck-trailer.com/  these guys have a huge inventory, and killer prices.   I rebuilt the brakes on a customers trailer for half what I could had I shopped at one of the big chains like Tractor Supply...  

These guys have everything from AC units for campers to spring kits & bushings if you're building your own.

Marine Audio/Video/Electronics Specialist