I have 2 full Belgains. One is 16.2 hds the other is 18.2 hds.
During the winter when there is no grass, 1 roll of hay lasts about 2 weeks. Now that it's summer and I have grass, I still have a hay roll so that they will come off the grass a little and give it a break. I dont' stall, they do better with 24/7 turn out, they are to big to be cooped up. I do at night lock them in the smaller pasture( 1/2 acre) with the hay, so the grass can have a small break.
As far as feed, my old guy eats like a light breed. But he don't do anything he's retired. My young guy on the other hand takes a little more, but I don' think you can say its double. NO SWEET FEED. It makes mine hot. I made the mistake one time and got the wrong feed, and said oh well I'll just give them this. One week of sweet feed and they were like 6 year olds on a case of Mountain Dew. Lets face it, a 2000 pound booger hunting freak is not much fun, so no more sweet feed at my house.
I feed Safe and Sound, its low starch and no molasses, I also feed beet pulp without molasses. My feed store is going to start carrying a new draft blend made just for the draft. Can't wait to see what its got in it.
Just if you have a draft you CAN NOT let them get away with something you would a light breed. Every horse should have manners. But if someone is going to be one of those owners that doesn't correct and lets the horse think they are in charge, they don't need a draft. Draft are so big that they can hurt you (not meaning to) just by getting in your space if your not careful, not knocking the light breed horses I know they can hurt you also.
But I love my drafts and have no regrets about anything.