I filled the rear tires of my tractor with RV antifreeze myself, largely because I had RV antifreeze on hand so it didn’t cost me anything. Haven’t had any issues with it leaking out. I just use a cheap pressure gauge making sure the valve stem is at the top when checking the pressure. Haven’t ruined the pressure gauge yet. I run the recommended air pressure. I think it’s 20lbs for the rears, I’d have to look to be sure . My dealership subs out tire work, didnt want to fill the tires when I bought my 1026r. Recommended I contact Rays or Pamps myself to get my tires filled . Kinda think it’s odd that a large tractor dealership didn’t do tire work themselves. Tire work isn’t all that hard to do .Especially if you have the proper tire tools.