as i age and its become a PITA to raise the 10K(with vette enclosed) 5th wheel box trailer off the pickup ball manually, i decided to go with a system that wouldn't tear the crap out of my rotator cuffs. i settled on the Bigfoot 12 volt electric over hydraulic lift leg. i'm completely satisfied with its functioning.its rated to lift up to 12 K lbs. google Bigfoot trailer jacks for more info.mike