We love Newmar motorhomes but personally, we would never purchase a full slide on any motorhome, not only Newmar. Just by the design you can see how things could go wrong.
Newmar basically invented slide mechanisms way back when. They have continued to use the same mechanism until this full slide deal and tag axles - basically with the addition of these big, heavy motorhomes being produced nowadays that folks seem to want. For these application they've switched to the HWH hydraulic slide. This is when the problem occurred.
Full-Timed for 16 Years
.... Back in S&B Again
Traveled 8 yr in a 40' 2004 Newmar Dutch Star Motorhome
& 8 yr in a 33' Travel Supreme 5th Wheel