I always thought it would be a neat thing to have a manual brake setup for when you park your trailer. Alas, it's wheel chocks for now! I usually get level side to side then chock the front of the wheels, pull into the chock a little and while there is pressure on the front chock I place the rear one. Then the trailer is as solid as it's going to get. Level it out and put the landing gear down. No matter what you do, it always wobbles a little.
I saw a sticker once that said, "If this trailer's rocking', we're brushing our teeth!"