Just to give an example of the Hughes/Directv connections - I was paying for their highest speed two way connection business line - D/Ls ran about 300k and the uploads were actually slower than a 56k modem (around 30k was the best I ever got) - if I did anymore than a free site and maybe two galleries worth of content, as well as the standard daily updates etc, I was capped off till 24 hours later
This was with their big dish that cost an arm and a leg - they also made me sign a statement that I wouldnt try to play with the thing as I evidently could bring down a small plane with it
I have looked at the systems for an RV and again it boils down to where you get the service - unfortunately Hughes subs are all going to suck in my opinion