What receiver model?
Once you have figured that out, look online for sany of several online retailers that offer a complete package, Dish and tripod and but one. Then, depending on how you connect, SWM or 4 wire you will need to go buy some coax cable. Find a suitable place inside where you could run the wires without having to drill more holes in the side of the RV. Since I run a 4 wire setup from my ground antenna, I bought two thru adapters that are mounted inside a compartment. Then I ran wire to the two places I wanted inputs and installed wall plates for the cable. If you go with SWM all it requires is one coax from the dish to the SWM power supply and splitter, Then another wire from the splitter to the Second TV location.