I've got the Larson mount. Yes it's pricey, but it works
No leaks in 2 yrs.
The key to securing the mount is to alternate while tightening the 4 retaining screws--think how you tighten lugnuts.

 

True but it does allow you to route the antenna coax cable into the cab without having to drill any holes.

 

This. I run the same one, except the dual nmo variant. Before that, I used an aluminum stake mount on the bed rail. Both good options depending on how much height over the truck you have to work with.

 

These are good for the aluminum bodies. I drilled a whole in my roof to semi-pemanent mount my antenna for my radio. I use a 2 way handheld as a scanner when im out doing photography. My magmount was good but the problem was the magnet detaching from the baseplate from the rust.