I have a 33' travel trailer. I use a 30" dish with sg1000 motor & pansat3500 @ the house. I live on a mountain and years back, the only internet I could get was direcway (hughes). When it was installed, they had provided a heavy duty roof mount for the dish, but never used it. It measures about 34" long, depending on how you measure it, and is designs to adjust it for different angles of roofs. It has two telescoping support poles on each side that really support the dish. I mounted it on the side of my travel trailer (making sure I hit one of the aluminum wall studs) and installed an outdoor 75 ohm jack outside. Inside, opposite where I installed it, is a kitchen cabinet with an inside and outside bottom with a couple inches in between. I had a 75 ohm jack on the bottom side of the cabinet nearby, so I installed another 75 ohm jack on the inside of the cabinet. The jack I installed on the inside of the cabinet, I wired & soldiered into the 75 ohm wiring system in the trailer. The outside jack is ran into the cabinet with regular screw connector on the end.
Ok, back to the roof mount, it is 2" id, with a carriage hole in it for the dish. I whacked off my dish mounted in the the yard with a saws all, leaving 6" of the pole on the dish, went to autozone and bought a exhaust pipe adapter that slipped into each piece, easily but snuggly to reconnect the dish back to my home pole. I inserted the muffle adapter into dish portion, drilled 2 holes thru and secured tightly with two bolts. Then drilled holes in bottom portion of muffler adapter to line up with holes on roof mount. I took the bolts for the bottom potion and drilled a hole thru the carriage bolts themselves so I could push a spring key or carter key thru it. Did the same for pole at home. I travel and stay gone a lot, so what I do, is pull the pins, unscrew 75 ohm cable from house to motor, throw the dish/motor in trailer and take off. When I get there, make sure I have trailer level (front to back) and drop it into mount, insert pins, connect cable from motor to outside jack on trailer, loosen couple bolts on roof mount and dish motor to adjust elevation. I use a tom tom gps in travels, find my long and lat, plug them into receiver, use receiver to point to sat I want and fine tune....works awesome for me, but this is just the quick run down....lol
Also, if you want something very simple, I know of a place that actually sells domes for rv that are actually only ku band, but not sure of features or limitations....hope this helps!!