Newbie Purchase and Install questions

Hi, All. Trying to piece this together.
Hughesnet is offering rebates and incentives, with a two year contract. I think I'd rather go it alone, as I do not know where I'm going to be for the next 24 months.
So I need a 7000 series system for best throughput, a direct way fiberglass or newer Hughes (rounder) dish. And I need a tripod. I'm seeing two types- a shorter one that looks more like a tripod for photographers and a larger one that has more cables, etc. and looks like it would take more storage room and more time to hook up.
I need a modem that has been de-commed or serials so I can check with Hughes as to its status.
And Hughes will sell me service direct? One dealer said you must be an installer to have a tripod mounted system. I can't beleive all you RVers out there are installers. I can follow instructions and I'm aware locking on the  wrong bird can cause havock. I'm sure I could do this with instruction.
I see lots of 7000 series on ebay- though most look like they are off a house. Can those be adapted to the tripod, or do i need the more oval directway style dish ( I think it is lighter?)
Any input is appreciated! Thanks in advance.