A test drive will tell you more about how a motorhome handles than just reviewing the specifications. A shorter wheel base gives more manuverability and handling problems can be fixed with after market products like Koni shocks, stiffer sway bars, track bars, safety steering gear, and 4 wheel alignments. A longer wheel base will be a little smoother on good highways but may limit the places you can go or turn into, and there are no after market fixes for that.
My 2012 Newmar Bay Star 2901 has a 190" wheel base with enough weight on the front axle and the improvements listed in my signature below that I do not get pushed around by the bow wave or turbulance from passing semis; I do not know I am being passed until I see the front of the semi coming along side.
If the front axle has about 40% of the weight the RV will probabley handle well.
2012 Bay Star 2901, 2 ACs, 5.5KW Onan, 765W solar & Outback FM-60, 800 AH Lifeline AGMs & Magnum MS2812 + AGS + BMK, Koni FSDs, Safe-T-Plus, Super Steer Rear Track Bar, MCD Duo shades w/powered cockpit, remodeled galley, Sumo springs and 2008 Tacoma 4x4 toad.