We had a Newmar with the stove and frig in a slide. Never a problem using it for 6 year as our fulltime rig. But we are talking about a quality built RV.
I'd decide on a brand and floorplan and then go to the forum for that brand and ask specific questions.
What worked flawlessly in a Newmar may be a nightmare in a different brand.
2012 Ram 3500 Laramie, DRW, 8' box, B&W Companion 2014 Montana 3150RL, with all the stuff.