I've been using portable ham and cb equipment with my wagon when needed. I also have a sun roof and have had good results with a mag base centered between the sun roof and 3rd break light. Only issue is scratching, as careful as I try to be I always get some.
I've also been looking at 3rd brake light (no drill) mounts that can be used for antennas and lighting. The Larson company in Texas seems to be the biggest player with the most options (
https://www.larsonelectronics.com/p...ge-ram-1500-permanent-no-drill-mounting-plate) but there are several other companies with similar mounts. Keep in mind our trucks are already 7' tall when stock, adding mounts and antennas can be problematic if you use parking garages, even most home garages are too low. In my area there are even some parkway (cars/passenger plates) overpasses that only have 8' clearances, unexpectedly came across one doing about 65mph at night without any road lighting, scared the hell out of me! :-0
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