Good news, I can help you with your tire chain inquiry.
The LT and P designations are important when selecting tires, because not all tires are equal, but not when selecting tire chains. The # PW1042 cables are a listed fit for your tire size, and are S Class compatible which means that they work well with low tire clearance. If you go with these chains I would highly recommend the # PW105 multi-arm adjusters. These adjusters will continue to perform even if one of the arms is compromised,... view full answer...
The Blue Ox Base Plate Kit # BX1619 (no longer available) that you referenced will work perfectly on your 1991 GMC S-15 Jimmy (as long as it's the 4WD model) and to connect to your existing Demco Kwik-Tow Tow Bar you would just need to add the Tow Bar Adapter # DM9523041.
The adapter pieces will let you connect the Demco Tow Bar to the Blue Ox Base Plate arms without issue. view full answer...
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