Try RIBs (Relay In a Box). http://www.functionaldevices.com
I use tons of these to switch all kinds of loads in BASs.
High quality, easy to install, clean. Rarely have a problem.
Thanks, I used two 3 pole n/o relays from RIB. Real nice. Emailed them with the situation. They responded with their suggestions and hooked me up with a supplier in my area. Installation was easy and they are really quiet.