j-d wrote:
A METAL plate is a good idea. Using "two-by's" can leave the jack too high if the tire is flat.
Harbor Fright's 12-ton jacks are on sale at $30, standard height or shorty. HF keeps changing their jack offerings. I went to buy a 12-ton and ended up with their 10-ton, which they no longer offer. Reviews indicate sometimes the current HF jacks won't fully retract. My 10-ton retracts OK and lifts one end of the rear axle satisfactorily. Even less capacity WILL lift it, but the handle effort's excessive given the awkward placement it takes to get under the axles.
I agree the higher capacity the jack is the less effort needed to operate it given the position one is in to said jack, so a 12 ton would be easier than a 6 ton and a 20 to a 12 or smaller.