Found the answer. There are 3 qualifications that will jepordize your pension. All 3 must apply for you to lose your pension.
1 Trade
2 Industry
3 Geography
As long as you only do 2 of the 3 you can work any amount of hours and not be penalized. In other words you can drive a truck in the same town as long as its not the same industry. Such as package delivery. Or you can work in a warehouse in a package delivery industry in the same area as long as you dont drive a truck. And you can drive a truck for UPS or FEDex as long as you leave the area and go to a different conference. Now these rules apply only to the western conference, I dont know about the others.
Quigley