I have a much smaller panel I used last summer while full timeing as camp host and it kept my battery charged for what I needed.
A few questions about your set up because I just moved mine around on its 15 foot lead to capture the max sun. Although it would work in ambiant sun I felt better when I saw ths sun right on it.
Do you plan to keep this panel on top of camper at all times even traveling down the road?
If so, did you build a cover to protect it? Does it need protection?
If not do you bring along a step-ladder so you can set it up?( do not think I would like this idea)
Even to get a cover off you would need to get up there.
I will have mounts on my truck cap and have made a 50 ft extension from #10 AWG wire. (The length of the extension can vary for your installation depending how you have your panel or panels wired (series or parallel) and your particular charge controller.)
I will have the option of leaving the panels on the trailer or transferring them to the tow vehicle. It has been suggested by PeterH that the fibreglass roof may not be able to withstand the forces of the wind on the panels. I will not be doing a road test until April so won't be able to report back until I take it for a few runs. Chances are I will get better gas mileage with the panels mounted on the cap of my truck so the wind can travel over/under and around the panels. You will notice that the aluminum support brackets are broadside to the oncoming wind when the panels are on top of the trailer. The brackets on my truck cap will be turned 90 degrees to allow for better air flow.
Either way the panels will be plugged into the charging circuit so that the batteries are being charged while I am travelling.
The panels weight
is only 35 lbs so it is just a matter of stepping up on a small stool to slide them on or off the trailer or truck. An easy one man operation.
There is no need to cover the panels. They are designed to withstand some punishment from the elements such as hail. As well if covered they will not be charging your batteries.
Once the project is complete and warmer weather comes back to Calgary then I will complete a video showing the setup in actual use.