As said, you'll need to find an antenna cube compatible with the recvr you plan to use.
I like using the portable cube model because its difficult to shoot a roof-top model thru trees and I didn't want to poke holes in my roof .
My Dish Network (pad-lockable) portable cube "Tailgater" antenna is compatible with the 211K recvr, they work together as a package. I use the RV month to month package and pay monthly as i need it. There is no activation fee to re-start service .
My antenna uses only one single cable which incorporates the Sat signal as well as 12v power to spin the 'auto-finder' , other antenna's might use separate wires, double check on that if that would matter to you.
In general , a cube is about $300-350 the recvrs are about $100-150 .
If you boondock, you'll need an inverter to run the recvr. I think it uses a constant 22 watts on or off.
If you try a new SAT system in your TT and you're not getting a signal thru the trailers OEM SAT input coax port, don't panic, Some new trailers have a procedure regarding the antenna power booster button being turned off and removing a jumper coax cable etc., just so you know, its usually a simple thing to configure and can be found in the TT owners manual or owners forum.