We also had a long super slide for the living room/dining area and one in the bedroom. No problems with them. However, I don't think that's what you're asking about.
Ourselves, we would be leery having a slide going the full length of the RV. That is a lot of weight and it couldn't be off an inch at one end for it to jam up.
They do seem to sell though so perhaps I'm wrong. Good luck!
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