Incredibly strong 8" "H" beam full length construction Each post supported by a massive all steel base for added stability Precision all steel rollers for longer lift life Widest inside span available 119", allowing plenty of clearance for truck side mirrors Extended post heights available, 14' and 16' overall, accommodating extra high vans and RV's Multi-section arm for easy positioning, and an automatic arm restraint system Full height safety shut off Optional adaptors for all vans and trucks