My groups of friends and I all ride Polaris Sportsmans (500, 700, 800) and Hawkeye's and even Trail Boss, we go deep up to the seat running all stock no snorkeling add ons and we all do pretty good. Not too many issues, no stalling, more like getting high centered on a sand bar/tree or something stupid, but keep the throttle steady to keep water out.

I would recommend after your deep water/mud runs drain the water from the belt housing, plastic underneath, easy to do, and let the wheeler run idle in park to dry the belt a little bit afterwards.

R'