Do many of you guys use wheel weights? I have a JD 3320 and have been thinking of adding some. I currently do not have my tires filled but always have a heavy implement on the back. I don't want to fill my tires because sometimes I'm on soft turf and want to be able to take the weight off. Are they easy to put on and take off? How much do they cost and weigh. I can't seem to find much info on them online. Thanks guys!