Welcome Greg. I agree with Ron, that the 2100 is the smallest but there are advantages to the 2350 at 23' 11", which is still very compact and with a 158" wheelbase, very agile. The layout that suits your needs best is the first to consider, imo. I think the 2350 layout is easier for two people, but it depends on how you like to use the living space. If it's the 2100 layout that attracts you over the 2350, then look at the 2400 which is only 3" longer, built on the 164" wheelbase. I also couldn't find a used unit that would suit my needs so bought new. This gave me the opportunity to customize a bit. I wanted the layout type of the 2100/2400 and the shortest unit possible, but I didn't want the 158" chassis cut to 138", and I didn't want to go to the 164" chassis, but would have if that was the only option. Phoenix built my 2100 on the 158" chassis uncut, so my finished unit is 22' 10". I also built on the E450, but I believe the E350 would have served fine. I appreciate the extra weight capacity of the E450, and to me it was worth it.