If you think 20' is enough, buy 24" Extra deck area is nice to have. My trailer is 21.5' of flat deck, 3' of beavertail, and almost 8' between the wheels. I put a Kubota B26 TLB with the backhoe, a 48"wide land plane, a 6' scraper blade, my pallet forks, a root/rock grapple, and the Kubota...