A couple of months ago one of my tag axle bags was found to have ruptured. I noticed a lean to one side and found the bag to be torn open at its fold point. This was while in storage so no experience with a blowout. I took a hard look at all 4 bags, 2 tag axle and 2 main bags and for OEM 1997 they look like they need replacing. All have cracks, some worse looking than others and at the fold over points, very worn looking. I've replaced the tag axle bags already but the main bags will have to be done at a shop due the rear dullies need ing to come off for access.