We picked the 303 for the shorter length and 2000 pounds less weight. We also liked the closet slide since that layout has decent size nightstands. We put 16" wheels and LT tires on ours (swapped from our trade in). We have found there is tons of storage, and still have several empty cabinets. I put spices in a little basket from the dollar store. The pantry is huge, plenty big enough for a 20# bag of dog food and a case of beer on the pantry floor, also big enough to carry a peck hand basket. I put my mop, stick vac, camper wash brush in the front of the basement along with the patio mat, small air compressor and the bottle jack. The main basement holds a large plastic box with hoses and stuff, another full of ham radio stuff, a Coleman grill, two anti gravity recliners, two bag chairs entry mat, and wheel chocks.
We have been on the road for close to four weeks, and are not feeling cramped or crowded.