Whoa, whoa, whoa!!! "Man card"??? You are seriously going to get yourself in trouble with the women on this forum. We use a mechanic now but I know how to put air in the tires, change the tire, change the oil, flush the radiator, gap the points and more. I've also changed batteries, distributor caps and wiring. I am the one that does most of the troubleshooting on the rig (though John does most of the repairs that don't require a mechanic).
I was once a poor person with a finicky car so I traveled with the matching repair manual and used it on many occasions. This skill cost me a boyfriend way back when. He was driving and my car died roadside. He got out to fiddle with this, that and the other thing under the hood. I sat in the car and pulled out the trusty repair manual. I figured out the problem, swapped a fuse from something we didn't need to something we did and called him back in to get on down the road. He was seriously upset that I had undermined his "manliness" by resolving the car issue myself. No amount of fiddling with the engine was going to fix it and nobody was nearby to see that I was the one that found the solution but his ego couldn't handle the situation and he was in the wind. His loss, my gain. I hereby revoke HIS "man card" because that guy was seriously lacking.
sorry for hijacking of the string - back to the regularly scheduled towing calculation discussion