My question is is there any type of card we would be able to get to gain access to bases without having to obtain a visitors pass at each individual base, It appears that many of the CGs are located on the actal base.
Sounds like your husband has MWR privileges. Most but not all mil campgrounds are on Base. But access to bases are not like it used to be.
Olden days... you would get a base decal from your base and go onto just about any other base. But today many bases seem to do their "own thing". Or at least that's what it seems like. I was told entire DOD base access program was getting rolled out base by base and phase by phase. So hard telling what phase the base your going to is in.
My McChord base decal didn't matter one bit at Yuma Marine Corp Air Station. I had to get one of Yuma's visitors passes. Another time when I drove wives car onto Mcchord that didn't even have a decal. Didn't matter, the gate guard "scanned" the bar code on the back of our ID card with a hand held bar code and said, have a good day. My local Coast guard station, a base decal doesn't seem to matter. Just have drivers window down a bit and lift up ID card from drivers window and the guard will wave you through from his chair from inside his guard shack. And we went to one base when passing by just to go to PX. Wouldn't let us on with a decal. We needed to be stationed there to have access to base.
The above web site has lots of info that would help you out. Fort Bragg vehicle registration office should be able to help you more. Link below.
https://www.basedirectory.com/fort-bragg-directory/vehicle-registration-center