And why not?
A Wilson 1000 mag mount consists of the whip, the screwable coil base, and then the magnetic base.
You can remove the coil base from the magnet base, and it screws on. There is an SO 239 connector in the magnet base and a PL 259 in the coil.
do you have a way to keep the so239 from grounding out to your roof? i think this is one thing that comes with the roof mount kit, that and the mount covers are different.
here is an idea of a heavy duty mount by breedlove if you don't like the wilson thu roof mount kit.
Sheet metal Backing Plates
on edit: scroll down to the bottom of page to see wilson 5k mount.