Hello Greg, I wrestled with this for a bit since I never liked the idea of carrying "fix a flat" around, but emergences do happen. I purchased the one described in the link below, the Longacre Ultra lightweight aluminum. Its fist rate, fits in the trunk of CSX perfectly, has a accurate gauge and is quality made USA! It has plenty of air for my Goodyear Billboards and worst case can get you to safety. Enjoy!
Longacre Ultra Lightweight Polished Air Tanks 50314 - SummitRacing.com