Lithium-ion Electric Tow Tractors & Burden Carrier Electric Lithium-ion Stand-Up Tow Tractor 10,000lbs Electric Lithium-ion Tow Tractor 4,500-13,500lbs Electric Lithium-ion Heavy Duty Tow Tractor 44,000-70,000lbs Electric Lithium-ion Burden Carrier 3,000-6,000lbs