......Make contact with a crane operator before you need the service so you know the cost and lifting / delivery services they can provide. Most businesses will not allow a non-tradesman or uninsured person on their roof. They are unlikely to want disassembly and roping parts down to the ground. Most would rather leave dishes on the roof than be bothered with any hassle for removal.
Another way is to erect your own. You will some angle iron of hq galv. Sched. 40 and a galv. sched. 40 pipe of the correct size for the dish. An arc welder. Or put it together using a bolt patterned of side mounting. Easy, no; but compared to paying for pre-patterned materials; pennies on the dollar. You can also tri-pod a corner; and if the deck is covered; put three pads to hold it outside the deck. The problem lies in wind resistance, where a 10 footer has to adhere to 10000 lbs. of force rule at a 100 mph wind. Even smaller windspeeds have a lot of force (like soft money) and really it must be strong and statically mounted no matter what . Can the deck hold it down? Usually yes; but decks are usually not static to the home. Can the decking and structure hold the weights and extra pressures of the dish? Better to drill a hole through the deck larger than the pipe and take a pipe to the ground; where you can put 4 barrels filled with on top of the "roof mount" allowing it to be held to the ground (and only need a plank to replace when you take it down). And when they have a real fiber to each home they'll allow you to have each channel you watch to be just as wide a bandwidth too; you will not need it!
I wish I could run a pole down to the ground but its not really an option. The deck is a part of the roof and is fairly protected by wind on two sides by a normal elevated roof but you are correct about weight. I'm in LA where the weather tends to be not a big issue although I'll probably run it by a friend who is a structural engineer to verify weight. I was hoping to find something similar to a Baird PL2