Well this really should belong in Road Warriors but a mod will take care of that.
Regarding the 1250 I can chime in with that. I have a 650F which is the exact same bike (same frame, engine bottom end, suspension, seat, etc just less torque and a few HP) And it does 2 up just fine.
The only thing I've noticed is the rear preload likes to be set correctly for the added weight. If you don't the front end gets a little lazy and in high crosswinds likes to wander a bit. Crank up the preload and it is just like it is 1 up.
And the shock is super easy to get to as well, takes 2 minutes and that includes the time it takes to go in and get a beer.