Drop leg jacks are great for loading, and quick to operate. Don't get crank down jacks unless you want to spend a lot of time cranking a lever.
I initially used blocks to support the rear of my trailer when loading -- generally two 6x6 per side. But once I got some experience, I just let the back of the trailer squat when loading. It's never enough to really lift the back of my SUV very much, and by letting the back of the trailer squat a little, the gate ramp angle is reduced which makes driving on easier, especially with a long implement on the 3-pt hitch. I can also get a very good idea of balance when loading and trying to position the tractor. Can almost feel/see the neutral balance point, then I pull forward a smidge to add some tongue weight.
My mesh rear gate is like a parachute above 60mph or so when the trailer is empty -- it's like hitting a wall. When I have a load on board, however, the draggy feeling goes away entirely and I simply notice the weight of the payload evenly across the entire speed range. If it's a light load, my SUV almost drives on the highway like there is no trailer in tow, suggesting that any load that blocks/diverts airflow from the mesh gate is obviously giving a drag reduction.
I probably wouldn't change my decision -- after using my trailer for nearly two years, I realize that towing a tractor is a small part of what I do with it, and there are times when 1) no gate is needed and it can be taken off -or- 2) the gate is desirable. For instance, when picking up some long lumber from the mill, it was nice to take the gate off and have an open back end. When picking up trees for landscaping, or bales of straw, or loads of gravel/mulch, the mesh gate is very nice to have. When moving lots of boxes and appliances to our new house recently, the mesh gate was awesome -- we could wheel hand truck loads of boxes and equipment up the ramp at the old house, and down the ramp at the new house. Kept three people busy with plenty of room to work. Everybody was impressed how versatile the trailer was for moving (just hope it doesn't rain!).
