I adjusted mine from the cockpit on the way home from the dealer. It was aimed for **** hunting. Right in the trees.
I soon put on the parabellum windshield and let the adjusting begin.
I got tired of re aiming the headlight especially since I no longer could adjust it on the fly. This out of a cheap $2.00 Line level. Clear silicone as the adhesive. I made sure the light was where I wanted it then stuck the level on.
Do as you wish, I adjust my suspension to get the headlight and mirrors right with a load. It was in the manual of my RT.
Start with proper sag, adjust the headlight. Add weight, adjust rear preload till the head light points where it should. Your sag will be the same as unloaded.
David