This is why I have solar as a stand-alone, standard controllers are not cheap and will for certain spoil your holiday if it packs in.
Installing a panel is extremely easy if you're fit enough to physically fit enough to lift it onto the roof, there are after all only two cables to mess with at a time, you install the controller and run cables to the battery first so it can read it, then once the panel is on fitted the roof there are special stick on with silicone brackets also on eBay, then run wires to the controller, you will need a roof entry gland, loads on eBay.
Firstly you need to consider if you actually need a panel or just want one, if you always have electric hook up then you probably don't, if you wild camp a lot you may need one but it's down to how many watts you consume while away and how long you stay and drive between camping stops, if all you do is charge a laptop and phones then you should not need one, we tried running a TV for 3 hours for two days staying in one place and didn't need a panel so I've not bothered to fit one since now we don't even take a TV, but a couple of tablets with our own individual downloads from Netflix and iPlayer.
I have two expensive panels in the garage which I keep meaning to put on eBay.
If you do go for a stand-alone setup, make sure you get an MPPT type controller as these are better at extracting power from a panel than the PWM type, and not much difference in the price unless you go top of the market
As far as I know, Moho control equipment does not have MPPT in them, but I may be wrong, I've just not seen it mentioned on any motorhome forum.