Doug,
I too have a tag that lifts however I do not use it often.
What I think is more important and useful than a tag that lifts is a tag that can vary the pressure on the tag while driving.
This adjustment allows you to change the weight each axle carries. If you are heavy on the steer axle you can reduce the pressure on the tag to move weight from the front to put it on the drive axle.
I am not sure if all tags have this feature but I would want it. Our coach has this and all Monaco, Holiday Ramblers and Beavers above a certain level have this.
Stuart