We have always purchased and manually set up the same antenna mounted at home when RVing, been doing it for over a couple of decades with both Directv and Dish. Took longer to get antenna out of basement storage and unravel coax than actually locking in satellites, all in all maybe 10 minutes to access all the channels on two vip receivers without restrictions or delay.
Our current rig is a class a and the previous owner threw in a couple of King tailgator pro 2 domes, one for Dish and the other for Directv. Having heard generally bad things about automated sat. acquiring domes I continued to bring along our manually set up antenna. Heard domes were slow and often had problems attaining all satellites among other minor issues.
Never worried about my manual satellite setup at a campground, didn't want our King tailgator growing legs and walking off. I purchased a roof mount that allowed easy removal of dome should trees or other obstruction require repositioning to acquire satellites. Saving space on storing dome, tripod, and excess coax were other positives to look forward to with roof mounted system.
To my surprise the King tailgator has performed flawlessly, easily attaining satellites without issue, even when RVing in a dense ponderosa pine forest. Have never had a reason to unclip from roof mount and reposition, it is always ready to go by the time we finish setting up rig upon arrival. Like any dome it is slower than residential antenna, couple of seconds if channel is on another satellite.
Can't speak on any other brand of automated satellite acquiring domes, again I never thought they were reliable enough to purchase from all that I've heard. We primarily do most of our RVing in the mountain west and SW regions of the country and never had reason to use eastern arc, we are satisfied with King tailgator performance and can always use manual setup if needed for eastern arc.