This setup proved to be a challenge. Fit 5 radios in a small S-10 pickup and keep it nice looking. I starting by buying a bunch of RadioShack's universal brackets and trying to piece them all together to hold each individual radio and then bolt them all together. This proved to be a disaster. It was very difficult to get everything to align up and by the time it was together the whole assembly was so big I was going to have to move the seat back a couple of notches so it could fit (I would have also had to grow longer legs). I then settled on taking all of the radios stacking the biggest at the bottom and working up to the smallest. I then zip-tied them all together and bolted the bottom radio to my cup holder witch attaches to the front of the seat in my truck. It slides onto a bracket which is part of the seat frame, very sturdy.

I made some modifications soon after the initial installation. I took the face off of the DR-610, pondered buying the remote cable, then after much technical soul searching I decide to make my own with the short 4 inch one that is included with the radio. I used some CAT-5 cable, a soldering iron, and a lot of electrical tape (never leave home without it). With the remote cable, I placed the base of the radio behind the seat and mounted the radio on the dash right below the A/C controls (see pic below).

Since the radios were all sandwiched together, the speakers were not putting out much audio (muffed by each other). So I placed several external speakers behind the seat. The base of the DR-610 was mounted in back as well with the external speakers.