140,000 Lbs. Capacity. Standard 29" Fixed Height. Combined Weight under 450 Lbs. 3" rail wheels for easy positioning. Lightweight Aluminum Construction. 6" Extension Available for 35" Height. 10" x 10" Replaceable Rubber Wear Pad. Easy to Position with Removable Handle. Spring loaded wheels retract when loaded. Can be disassembled quickly for easy handling. 29" Aluminum Extension Included