I'm trying not to go full cruiser, but it seems that my wife is not interested in 2up on ANY sportbike (even an FJR).
Could you elaborate? It can't strictly be to avoid a fetal position because the rear passenger on FJR or ST is no where near a fetal position. Plus the seats are wider than a sportbike and there is plenty of space for her hairdryer, etc in the sidebags. It it something to do with the style? Is she afraid of being on anything but a cruiser (with those narrow seats and not all that great of a suspension)?
Lee here... yeah, I loved my VMAX... I had both the 1st Gen and 2nd Gen. The 2nd Gen is awesome, but its not a good bike for two-up riding even with the small backrest you can get. Just as Matt said, the small gas tank and the fuel economy was lousy. It was truly just a houligan/in-town bike. I could never take it on a sporty ride because riding agressively, I was desperately searching for a gas station at about 90 miles. A stock one gets a little better mileage, but not much better. I had it piped with K&N intake, PCV and dyno-tuned. Its an amazing thrill to ride, but you better plan out your gas stops! ---- for the record... it handles a hell of a lot better than people will say. Get the suspension right, lose the catalytic converter and try not to lay down the throttle too hard mid-corner and she handles quite well.
A VTX 1800 doesn't exactly get amazing fuel range.