Spud, 3 years ago, a Lift-a-Load trailer capable of hauling 10,000 lbs was $16,000. The other trailer whose bed can go down to the ground (but unlike the Lift-a-Load not to dock height as well) is the Triple L, which is about $9,000 for 10K capacity.
But the Triple L is a rather doofus looking affair if not the box side type, since it needs those sides for the lifting track. So even without sides it has to have a framework for the lift track, which gets in the way.
So, this new Lo Riser seems to be the first "almost to the ground" open sided trailer that seems practical.