I used this system:
It's wireless and works very well. I tapped in to the existing 12Vdc wire that powered the original. Same thing up front. It fills the space nicely with Velcro. You will need to cut a hole to allow the antenna connector to shoot thru. I put a 1 foot extension on the front antenna and a leave it exposed. I bought an extra camera and mounted it on the ladder facing to the left so I can see gas pumps. I powered it from the running lights. Just need to remember to turn on parking lights.
2005 Sun Voyager Workhorse W24 with 8.1 ltr Chevy. Allison 2100 transmission. Full body paint.