I have talked to a few with JT's, great way to go for sure. We added a step support, simple slide out jacks, and a pin tripod... the trailer is very stable now. A friend of ours added a set of travel trailer jacks in the mid section of his trailer and it made a huge difference as well. Curious if you got this issue resolved... let us know.
I actually installed the jts after findIng them on sale. Install was pretty straightforward, had to modify the rear install aa the supplied self taps they sent were about worthless. So far I've been pretty happy after reading the proper set up instructions the trailer feels a lot more stable now. I have considered as the steps still have a lot of play adding to that area as well.