Something not mentioned but may be worth looking into.... Contact the RV Park to see if there is a dealer locally who offers RV Calibrations. Or contact a dealer locally and see if they do that and at what price.
I added this service to my company and have a dedicated Driver just for the RV Parks in the Spring/Summer. Most RV Parks know who the local Satellite Providers are and some get a little commission for advertising for them.
If you know exactly where you plan to stay the Sat-Guy may even offer a discount if you bring him continuous business