Hey Hay,
Do you have a particular make/model SS you'll be moving?
Hauling round or big square bales?
How often moving your zero turn?
I ask the last question because if only occasionally, you might get away
side loading with some sort of "loose" ramps like used for a p/u truck and make them long for the break over angle. The zero turn seems like the big hang up for all 3 of your estimated usage. One other idea is (again if it's only occasionally) could you just flop down a piece of 3/4 plywood across the ramps? I can't tell if those ramps are over 4" long, and it's a little hillbilly but........
I ask about the SS to echo a previous concern - 10' is pretty tight but should work, but the angle of the ramps/beaver tail may preclude you to ONLY backing up onto the trlr. Then there's the ramps, ifin it's a big SS, you may need to add a mid span "leg" to the 2 outside ramps. You'll know if they start to get a little sag in them.
That's a stout, weird little trailer and for that money you could decide that it doesn't quite do what you want and spent several thousand dollars at the welders shop doing some serious alterations and still have a good value.:thumbsup: