[thenewkid64]

To mount the panels on the roof you must do a bit of measuring.

If you can get them to fit, then they can be mounted with a simple L shaped Alumimum bracket. This bracket is mounted to the panel in a location that will sit on a rib. This bracket is then riveted through the bracket and skin to the rib. Use one of the availble vulcem sealers to do it and use large rivets for strength. You will want to "pot" the rivet with a dab of sealant over the top for extra measure.

Before mounting I would wirie the output of the panel to a watertight quick disconnect. This way you are able to install the panels and wire to them afterwords.

One thing to be sure to do is to ground the panel. In the box on the back of the panel where the + and - connections are there is a ground. You may think the mounting system will ground it, but the only way to be sure that there is no static buildup that could kill sensitive electronics (Refer board, furnace boards, on board 12 vdc radios, etc) is to gound this to the panel frame. The frames are not connected electrically with the solar film itself and the movement of air over the panel in transit can cause a big zap.

You mentioned that you trailer was pre wired. Depending on the AWG size of the wire and number of panels, it may be better to re-wire it. You don't want to spend all that $$$ and have the prewire choking the feed to the battery.