we have a HQSD 100 w panel that we carry around in our van. we don't mount it to the camper because we have used it with 3 different camping set ups. I have bought several HQSD 30 amp charge controllers. and have installed them in the different campers. we also like to set up in the shade and so want to be able to move the panel around. I also think the panel might last longer from not being in the elements all of the time, even when not in use.
In our 95 rialta, we have a dometic 12 v (danfoss compresses) refrigerator/freezer instead of a gas fridge. It works great, but will use about 3-4 Ah every time it starts up. on a hot day, it can pull down the charge of the batteries. The rialta has a generator on board, but it is not very quiet, so we really liked using the solar. We have 2 100 Ah batteries in that camper, so it really gives us a lot of reserve.
when we got the fun finder, we put in another charge controller and even though we don't use that much power from our battery, it is great to charge it up after a cold night where the furnace comes on a few times.
the HQSD products seem very efficient and work so well we don't think about it much. They aren't real fancy, but once set up, it is nice to just be able to glance at the charge controller and check the battery level.
they do come with wiring connectors that would be a pain to use if not permanently installed, so we changed them. It looks funny, but we cut off one end of a heavy duty extension cord and connected it to the charge controller. We then wired a heavy duty plug end to the panel. When we camp, we set up the panel in a good sunny spot, then pull out the cord out from the charge controller and plug it in. the controllers and cords are mounted in different spots on each camper.
On the fun finder, I put the charge controller under the fridge, on the door of that little cabinet.
It's become one of our regular camping set up chores, and we kind of enjoy it.