outside speakers

Hello everyone. Last year I turned an old ambulance into a mobile tailgating rig and need some advice on getting sound outside. Last season we ran two outdoor deck speakers on the roof of the ambulance connected to a 100 Watt amp. During the offseason, the speakers lost a battle with a tree...

So i have already in my truck 2 12" Jackhammers with a 1250w matching amp. what i want to do is get an additional two, 2 channel amps. One for my door speakers to run all of the time, and one for speakers outside of the cab with a toggle switch. Questions: Can I run 3 amps off of one H/U...