[Carl n Susan]

Never having owned either, but very familiar with the 3400, I did have to Google the Everest 344J. Turns out it has a similar floor plan to the 3400. The location of the washer/dryer being the major difference.

Many models of Montanas have the washer/dryer in the bedroom. The 3400 was one of the exceptions. Despite being one of Montanas best selling and popular models, the geniuses at the mothership decided to discontinue the 3400 a few years ago. But then the whole Everest line, including the 344J, disappeared around 2009 (??). I conclude you are looking at used versions of these RVs rather than new.

As for tires, Montana, just like its competitors, have become heavier and heavier over time. The vendor tended to install the cheapest tire they could find. After many complaints, Montana, and others, have started using Sailun tires in an attempt to stay inexpensive but have a quality tire. Tires are a concern on any 15,000+ lb. RV.