I have for sale my 91039 floor jack from Harbor Freight with built on Engage Offroad skid plate and bed mount. The jack has only been used about 4 times. Lifts the rear under the diff and the front under the lower control arms or use a big block of wood. Max lift height is 14".
The pic below is the actual item for sale, however, since it's been in the bed, it is not as clean as the pic shows.
The skid and mount go for $175 and the jack goes for almost $100.
Selling altogether and ready to mount in your bed for $200 cash firm or I will just keep it at home for a spare. Local pickup only as this item weighs about 35 pounds.