97 K1500 suburban, 112000 miles. The rear end is sagging a bit and I was thinking about putting on some helper springs to help it out. I was in Pep Boys earlier and saw some that would add 2000# capacity to the back end (not too shabby) for around $50. I have spent the last 1/2 hour or so online checking some out and can't seem to find them below $160...and that's on E-Bay. Has anyone ever used the PB springs. The biggest I tow (currently) is a 7 X 12 trailer with maybe a few bikes on it. Or some furniture.