The best brand that makes treadmills with high-weight capacities is Sole Fitness. This company makes heavy Duty treadmills but keeps prices below the $2k mark. Other companies that produce high weight capacity treadmills are Life Fitness, Reebok, and Life Span. Still, most of these treadmills are designed for serious runners and commercial gyms, which means they are full commercial grade and they cost more than $2000.