I got a new custom dual axle trailer for a very light 21' jet boat. (got the second axle for looks more than necessity)
Thing is it rides kinda high. I'd like to drop it an inch or so.
There's about 2" or more of clearance between the tire and fenders.

Looks like you can just loosen the bolt on each wheel's arm and let the trailer drop down to a lower stance then tighten the bolts. (clamp appears to be just clamped on to the splined axle.
Is it this simple? Looks like the angle of motion on the arms would still be ok.

thoughts?

nobody has tweaked their trailer for better stance?

Interesting question. I have considered putting a smaller set of wheels/tires on my torsion axle trailer to lower it. The ramps at Lake Mead are very shallow and I have to back the truck in to the floorbaords to get the boat off.

Don't do this. The one time you get caught at a steep ramp with a sharp angle at the top, you will get the trailer stuck on a cross member, and you will be in a REAL bind. I've been there. It sucks. We were launching a 37' boat on a POS trailer a few months back. Granted the trailer really was a POS, but I had to back down the short and steep ramp at a 45* angle AT 30MPH in 4WD to get past the grinding/catching. That was a little hair raising, and one of the worst sounds imaginable

Just keep an eye on your rear differential in your truck. I don't think they make any of them that have vent tubes anymore, but just make sure your rear differential is not absorbing water, and you are not going to hurt the truck with a little fresh water bath.

Already considered this. '08 Tahoe has a factory vent tube that extends up above the differential to the underside of the body.

Understand your point about the trailer dragging on apex of a ramp, but it is a shorter two axle trailer (this problem is with the 260 SS, not the 382). Even 1-2 inches would make a huge difference in how far I have to back in at the ramps here. Even a smaller profile tire would help, but then smaller tires would make for more heat build-up on long tows, so ...