??? about TC on truck 24/7

Not sure if this is ok or not. I have a crew cab dully truck, and the tc is 4500lbs. If I leave it on the truck sitting all year with jacks down, I lift the tc up half way to lighten it a bit. will it still hurt the springs? or wear it out? I take the truck and camper to work once a week or once every two weeks, just to run it.
some guys here on this tc forum has their camper on all year but uses it.
like to have the tc on the truck ready to go when I decide to use it at the last min.
any thoughts?