I use a portable dish and plug it in via the offside antenna plug, works fine. My system is a permanently connected setup (aside form the dish) and the dish resides on a fixed rear bumper mount when not used, so its out of sight out of mind until I need it Ive had the portable sat setup for almost 10years, and I can get it running faster than it takes the Princess to connect the power and water. (sometimes I hide the tap fittings to get a head start)
Ive never really ever thought about the auto dish, I expect because they werent an option way back when I got the first dish, they are very expensive, I don't find the portable system a chore, and can see a couple of potential (positional) drawbacks with the auto dish, that are present with the portable. We use the sat dish almost exclusively and in almost 10 years there has only been one single occasion (at the very start) where I didn't have enough coax to get past the trees.
I have a 20.63, so if you run with the auto dish please post the process. You never know, I may completely change my mind.
I just put in bigger tent pegs, and go back to watching TV