Don't know the r value but we have the 385bh and we are full time. It seems to do well.
I think it is one of the better coaches out there.
They all have their issues but I believe if the dealers did a proper pre delivery inspection you would see less problems with new coaches. Sadly the dealers drop the ball in this area they are too interested in getting your money and to get them to own up to their mistakes is like beating your head against a wall
Take your time and completely check your coach over when you take delivery especially if you buy from La Mesa RV.
Check your drain pipes under the sinks that they are tight, that they tighten and use the lock tabs on your hitch if they install it in your truck.
Also take the time to learn about your coach and how to make repairs yourself because the dealerships for the most part don't seem to have a clue.