I have a 23 ft with one slide and bunks for the kids. Double axles were a must. The single width bunks may be too narrow when the boys reach full size, but by then I doubt we will be going on long trips together often. Mine also has two doors which helps a lot with the traffic flow with two pre-teen boys. I wanted a less than 20 ft trailer originally but could not find a double axle that small in my market. We go out for about 4-5 weeks each summer and a while I very occasionally wish for a smaller one, just 1-2 rainy days trapped in a trailer with two 13-year-old boys makes me glad I went for the extra space. Rarely when spending several days in one place I want a little more room, but when I pull it I'm glad I did not over stretch my tow vehicle capacity.