so what wire do you usually use as the negative? Copper or silver?

We have a 1500/3000 watt power inverter, its got the standard positive (+) , negative (-), but its also got a ground? This wont be in a car, it'll be sitting in a football field for halftime for a marching band powering the PA system, so it cant be grounded to a truck, and even so, wouldn't...

Hey, everyone been a minute working and busy. Anyway I picked up some rims I first went to Big O tires and they quoted me 948$ for some 16’s in the style I wanted with a negative offset. The EBay Guru that I am (also a cheapskate) I picked up some new rims in the style I wanted for 418$...