I have been using a Wilson 1000 mag mount on my pickup, which works fine. However it is too tall for my carport. I want to use a 4 or 5 foot top loaded fiberglass antenna. I have an aluminum toolbox, would it be ok to just use one of the antenna brackets made for mirrors on semis? I could drill the holes and use some good nuts and bolts to secure it. Would the paint cause any problems as far as getting a good ground. Thanks.