As trucks get higher and higher, will your tripod jacks still work? Heavy duty Lift Extension kit raises the lift height 8". For 4-wheel drives or trucks with lift kits. Easily inserts between tripod tube and jack post. Use with four jack systems only. Zinc plated. Choose Standard duty for most campers or Heavy Duty (94-003) for heavy campers. 4 per box. This is a special order item and is not stocked in our store. Please call for availability.