The Sammy will pull them... BUT, be extra careful when you are spinning them and drop them down on something with traction.. that is a LOT of weight for those small componants to handle...
Most trail breakage I have seen is with heavy tires and wheels, spinning in mud, and hitting a root, or spinning on rocks, and then getting sudden traction.. something has to give.. and it won't be the traction.. it'll be u-joints, axles, r&p's, housings.. etc...
Just use sense when in tight spots and you will probably be OK, lot's of Sammys run tires that big...