If you're RVing, why not just shell out the dollars for the Tailgater for use with a 211k. All you do is set it on level ground, punch in the state, and it auto-installs itself for the western arc. Personally, I think setting up for the WA is a bit easier than the EA especially if you're using a tripod. If you go that route with the full reflector, get a good tripod with a leveler.