Newmar is credited with building the first flat floor slides. They built their own systems. Now they are using the HWH system like we have but only seems to be in some of their higher end rigs.
Our CC has one flat floor slide but it's an HWH hydraulic unit and CC went out of business about 2010 although now it's owned by Winnebago.
2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft
Charter Good Sam Lifetime Member, FMCA, SKP
RV'ing since 1957, NRA Benefactor Life, towing '05 Odyssey