OK, I can't speak about the TrailTough set, but I can tell you this about Calmini vs. Rocky Road.
Calmini install requires you to file some aluminum from the inside of the case. It took me about a half hour, with a hand file.
On the RRO set, they want you to send them your transfer case, and they send you one, which has been hogged out, and welded over. If you don't send them your xfer case, they want something like an additional $150 core charge.