I have an almost 18h 6yr Shire: right now we have a 4h BP trailer 7'3" tall in which he basically has two stalls. We eventually want to sell this trailer and get a GN (we like some slant Featherlites that come with 50" stall and 7'6" W & T).
We usually always had the draft(1700lbs+) in the back 2 stalls and a QH/TB cross 16h(1100lbs) in the front, but recently we switched them, since the trailer was starting to sway due to low tongue weight.