Slide outs HWH vs Valid Engineering glide out rooms

[Birdman]

I read on this forum Newell originally installed HWH glide out rooms in 1997 and then starting with coach #645 began using the Valid Engineering glide out rooms. Why the switch? are the early slide units problematic? Are there any year/s I should stay away from and why??

Carl Bird

[NewellCrazy]

The advantage of the Valid vs the HWH is the former takes less energy to slide out because it has ball bearing tracts and it is operated by a 12v motor. The HWH slide out is hydraulic and if a hose breaks or leaks; it makes a mess.