Have not seen nor tried these jack savers but for myself I prefer gadgets that work with minimum efforts on our part. These jack savers require us to pin and un-pin the jack. What i did see first hand was a set of 6", 4 bolt swiveling dolly wheels welded to the bumper of a 30 foot camper as it entered a Marathon gas station and when the rear end of the camper dipped down wards the rear dolly wheels gently lifted the rear of the camper saving the stabilizer jacks. I pulled in behind the camper and asked the owner if he was happy with his wheels. He said he absolutely was and you had to be careful of large potholes when entering gas stations or entrance ramps at campgrounds and always slow down while engaging the wheels to the ground. He had these wheels bolted on at first and after some trial runs he decided to weld them on. What a cool solution to dragging campers and stabilizer jack killers.