I do not know anything about the Timbren system, except it is made in Canada. According to their website, it shows you can buy them online and install them yourself, but there are no "dealers" in the USA.
I have done a lot of things on our 5th wheel, but I do not believe I would attempt changing out axles to an independent system, with the welding, aligning, etc, so everything rides and tracks right. The other side to is, I also do not believe I would want a dealer or someone other than the company who made the system, install it. But I also do not trust dealers, or their "service centers", because of past experiences.
We do have the MORryde IS system which is axle-less. It was installed 3 years ago for around $3200.00, with the snowbird discount they offer. We did not go with disc brakes (an extra $2,200), because we had new 8000# axles installed just 2 weeks prior to installation of the IS system. The tech who installed our IS system at MORrdye said with the axles being new, he would use the hubs and brakes as the brakes are 3 1/2" and would stop the unit easily, (why we did not keep the 8000# axles, is another looooong story all together). Since then we have never had problems stopping on a dime when we need to, or problems with the hubs or shoes. We have traveled in the mountains with no problems, but we do have an exhaust brake on the truck, which helps a lot. We would not have anything but the MORrdye IS, we also have the MORryde pin box. Our 5th wheel tips the scales at 18,300 lbs loaded, we also have RideRite air bags on the truck. Everything "rides" smooth and we do not feel anything when traveling, not at all like we did with axles!!
Hope this helps and God bless,