I have a 2011 Starcraft AR-ONE 15RB.The unloaded weight is 2490 lbs and the same unit without the fold-out bunk end would weigh 2260. So for my unit the bunk end would adds approx 230 lbs. This most likely includes the internal bracing needed since the fold down door is relatively light The bunk end adds a lot of inside space which sometimes I just use as storage when camping. Great place to put grand-kids when they come along.
I have towed it short distances with my Subaru Forester, but normally use my Ford Explorer. A 2500 lb unit I believe could easily be towed with a Ford Escape or similar SUV.
See my 15RB at
My Campers.