I've had myself and two of my friends - about 650 lbs all together in my Max IV (26" tires and Kohler 20HP) , a custom cage and body band (at least 100lbs) and about 25 lbs worth of gear in a pond and had no issues at all - I was pleased with how stable it was too. I rocked it side to side after I got comfortable with it to test the limits and never felt like it would flip or take on water.