I got the DR650SE because it has enough power/torque, gearspread, stability, and smoothness to also run slab...2up and on a budget. It's about as tall and heavy as I would want to ride offroad. Bigger people may be fine on some of the heavier beasts. I dump it a lot, mostly from lack of skill and short legs, but I'm strong enough to pick it up, repeatedly, by just grabbing the bars. Using better technique makes it even easier.
Most of the smaller-displacement bikes that have enough power to slab are even taller than the DR, and they likely won't have the down-low torque to easily tractor up sandy hills with a passenger on the back. The DR actually isn't difficult to ride over most terrain I've yet encountered...as long as you have appropriate tires, AND you're not in a hurry. Don't try to keep up with real enduro bikes on a packmule like this unless you've got some serious skills.