I installed the correct track on my 28.5 a few years ago. Funny thing is I believe I have the boot style hangers. I didnt see anything at the time to not use it on that and the correct track was made for lifting the unit up by about 4".
Only slight issue I had was my center supports would shift ever so slightly and not stay straight up and down. I ended up drilling a third hole and added another bolt and nut and that took care of the problem for the center section.
I have over 20K miles on the set up and did the bigger tires, correct track, hitch adjustments, lowering shackles for my F350. It now is level while towing. Just wish Ford didnt make there new trucks so tall. It would have saved me alot of time and money.
2018 Ford F350 6.7
2017 Jayco 28.5 RSTS