I bought a set for my KZ 29' Toy hauler in the spring of 2016, so almost two years old now. Installed them myself, have had no problems at all with them. I do race tracks so I am on concrete, but have a dirt area at home where I use pads under them.
I probably have run them up and down close to 100 times a year.
I bought the "folding" style.
Send me a PM with your email, be happy to send you some installation pictures.
KZ MXT2920, Ford F250 4dr long bed
Bunch of Motorcycles - Track Instruction and Race
German Shepherd "Qorkey"