If you use turn snaps, you are still going to have to drill holes to fasten them to the RV. There are many different options, but some of them are better than others. I have seen some that use hay bales to enclose around their RV. Might do the job, but looks real tacky. Another possibility would be get some 4X8 sheets of wood and fasten batt insulation to one side. Cut to fit and use metal stakes or re rod to hold them in place. The outside could be painted or decorated. I don't know what the cost comparison is, but regular trailer skirting may be an option too. There are other options also, it kind of goes with the saying necessity is the mother of invention.
Roger & Cheryl Full Time since 2002, RVing since 1975 2008 Chevy 3500 Crew Cab Dually, 2012 RW 36RL