Doug.....some tags lift off of the ground and some just take the weight off of them. I think it looks cool when a tag lifts all the way up. Mine only takes the weight off of it.
You would have to do your homework to know which ones do what when looking online. I think once you find that a tag lifts off the ground on one level of coach, like a Monaco Dynasty, you'll know that the Dynasty and the models above it will lift.
I can't think of any Freightliners that lift off of the ground, maybe others can add what brands do what.