I've flat towed my Sami thousands of miles with no problems. If you really want to avoid issues, some people remove the rear drive shaft to avoid the risk of it separating. Judging from experiences on several BBs, this doesn't seem to be an issue if your drive shaft is the correct length for your lift, has enough slip yoke length for your suspension travel, and is well maintained. (I'm lifted 2.5" with stock shafts and don't bother pulling the dshaft.) You might consider pinning missing links if you've got them to minimize droop.
The 2" shaft is akin to most receiver hitches on the other end. A pic would tell a lot here.
I often load the sami under tow with a few hundred pounds of firewood, etc and it's fine. I usually load it either behind the front seats or on the passenger side floor to avoid shifter conflict. Note that the owners manual suggests TCase in neutral, Trans in 2nd while towing. Stop every 200 miles to idle the engine thus lubing the tcase.
A trick I learned is to turn the key on then turn it all the way off. If you don't remove it, the column remains unlocked.
Cheers,
D