With leaf spring suspension for Trailer Aid Plus axles cannot lift the front wheel high enough to remove the flat tire behind it. and replaced with a spare part. So I tried using plastic stabilizer blocks to get it high enough for ground clearance and the Trailer Aide Plus just broke. Mind you, my 5th wheel only weighed about 10,000 pounds. that day and only had to carry half that weight. Reportedly, Aid Plus costs Β£15,000. Fortunately, a bottle jack was also available for the job. Great product idea, but the "saddle" in the ramp is too low to get the necessary clearance with independent wheel suspension.