A couple of weeks ago I purchased a 100 Watt Renogy Solar panel and other hardware to add Solar to my RV. Today, proudly splashed across the top of a web page I saw an advertisement from Amazon for a 160 Watt Solar panel from Go Power that costs three times what I paid for my whole Solar System (wires, brackets, controller, everything)!
I paid $125 for my 100 Watt Renogy panel and the 160 Watt Go Power panel is $630.85. That is quite a difference ( + 225% ), especially when you consider the $ per watt cost: $1.25 vs $3.94 ($ cost/watts).
My point is that you need to be a Savvy, Well Informed, customer before you spend more of your, hard earned, money than is necessary just to add Solar to your RV.