What you need is Lippert's adapter kit # 314597. These have to be used in order to get the needed clearance. Even then, it may be a little tight. The BAL instructions don't mention this and I couldn't figure it out at first.
The other pics show how I installed our Lock Arms (2 only at rear). I mounted the upper brackets to the bumper as there was really nowhere else. Has the benefit though of providing some fore/aft reduction in trailer movement. I found that if you mount the bottom of the Lock Arms to the jack pad, you get a bit too much movement so I mounted them to the Lippert foot pad. While doing all this, I bolted on some 8 x 8 x 3/4" HDPE for permanent foot pads. After I mounted the upper brackets to the bumper I discovered that the inner and outer strut tubes weren't long enough and they would separate. Solved that by welding in a 10" section of 1" tubing.
Movement in the rear of our TT is substantially reduced. I would add a pair to the front but they would be well back from the front cap and hard to reach without crawling on the ground.
FWIW, I replaced the nuts & bolts in the lower part of the Lippert stab. arms with stainless steel because they were significantly corroded after just one year of use. Got exposed to a lot of road salt from being delivered in the winter.