How they ride depends on their shoulder slope and conformation...just like with regular horses..If you buy one with too upright a shoulder , you'll get a rougher ride..
There are basically two types of Belgians. The short stocky ones that resemble their Brabant cousins and the Hitch type that were bred for height and leg action. As for food, mine eat 50 lbs a day when you work them. My girl is 17.2 hands and weighs in at almost 2000 lbs. My Percherons team is taller and weighs about the same.. 50# is what they are supposed to get. Preferably no grain at all since they are very prone to EPSM and will tie up. People that think they only need 35 pounds are trying to keep them a riding horse so smaller tack will fit..You loose the muscle and conditioning they require to hold those big bones together. Large draft crosses that are worked will also require almost as food as their full blooded relations.
My Belgian mare is Farceur line..known for their weight pulling ability. She has old blood lines that aren't the new finer boned ones..
Here is Deb with TWinkie my APHA mare who is 15.2 hands
Deb with Angel...her daughter and Twinkie
Getting a much needed hoof trim with my husband who is 6'2" and closer to 300 #'s than he will admit...
When we got Buck and Judy our Percherons, their owner was feeding them a 50 # bale of hay a day for the two of them and thought they looked good. He was riding Buck.
This is Buck then
And now with his proper weight and condition..
Hope that helps a bit..Just remember ...a draft horse is still a horse and not always the gentle giant many claim they are..the difference is about a 1000 lbs. I ditto everything that waterbuggies says!