It's not hard at all to use an HD dish if what you want is HD in your coach. It's really not that much harder that pointing a standard dish, but it does have a bit of a learning curve.
Josslund,
Yes, if you are currently a DirecTV customer you just take a receiver from the house and use it in the RV. UNLESS you happen to have a Genie or an H25 receiver. These receivers require DTV's SWM technology and will not work with the RV portable antennas without the addition of a special SWM kit. It's only about $100 to add the kit but it is an extra step.
All of the DirecTV receivers that require this SWM technology will have green labels where the serial numbers are found.
You can also look at the Winegard Anser (semi-automatic) or Carryout (automatic) units.
Just remember that you cannot get the DirecTV HD programming with these type antennas.
What I post is my 2 cents and nothing more. Please don't read anything into my post that's not there. If you disagree, that's OK.
Can't we all just get along?