Newmar was the FIRST to design and install slide rooms in RV's. They have a Patent on their design and slide mechanism's. Newmar Slide systems are ONLY used on Newmar as they own the design. Other RV makers buy their slide systems from aftermarket companies. So, they have built Slides for over 30 years using the almost same exact design and system and they have very few problems with their systems. We sold Newmar from 1994 till we dropped them in 2009. I am Service tech. Newmar slide mechanisms AND their slide seal system is by far the BEST ever designed and built. It is extremely rare to find a Newmar slide system that malfunctions and also, a Newmar SEAL systems that leaks. After a few years you may have to replace a defective worn seal on a Newmar, but they rarely leak due to the design. So, to answer your question, WHY fool around and change a 30 year proven design? They do NOT, and that is why you have those heavy duty steel ram supports. Doug
PS, just saw your other post. Until 2009, we sold BOTH Newmar and Tiffin. The reason we dropped Newmar was because Newmar raised their prices for a comparable Tiffin and we sold more Tiffins instead of Newmar and could not sell Newmar's due to that. It was hard dropping Newmar as they build a very good Motorhome. Doug
