I've had mine to 95 a couple of times loaded and with a passenger, but only briefly, as in passing on the interstate/highway, and have not experienced any ill effects (wobble) during those times. However, after returning from a trip like that, and having the shocks at 30psi,and the rear tire at 40-42psi, I was riding in to work with just me on the bike, put it in a long sweeper at about 80mph, and it "wiggled" some on me...it is NOT a good feeling. I think these bikes are very sensitive to pressures in tires/shocks, as other times when alone and shocks at about 10psi and rear tire at 36, I have experienced no problems at the same speed in the same turn, and I've had it in a straight line up to 100mph, again briefly. It's no where near the limits of what it will do, still pulling strong. I generally cruise when loaded and traveling at 75, if conditions allow.
I can vouch that with just me and Suzanne on the back (no luggage), the bike will lift the front wheel shifting from 1st to 2nd if you romp on her....