Felling Trailers Hydraulic Ramp options eliminate the need for operators to lower or raise the ramps on their Felling trailer. The Hydraulic Ramp system does all the lifting for you, helping to prevent back injuries and increase workplace safety. The Hydraulic Ramp System is available on 20,000 lb. capacity tag trailers to 100,000 lb. hydraulic detach trailers. This system has been found as an ideal option on several semi-trailer lines such as our OTR,MX,Narrow Neck as well as our Drill Series tags (also available on select Drop-Deck models).