Problems with 2005 Dodge Ram 1500 SLT?

[Chris]

I have a 2005 Dodge Ram 1500 SLT 4x5. Its got the 4.7L engine in it. Now im having massive problems over and over with the engine. I got some water into the intake about a year ago. And i had the insurance company put in a new engine.. that engine went bad like 1 week later.. some how it blew a gasket, cracked the heads, and some other stuff... after that they replaced the engine AGAIN.. about 2 weeks later that engine dies on me.. another engine AGAIN.. this one has a rod knock.... I am on engine SIX from this.. its been to the dealership, local shops, and anyone who does engines. I dont know if the 4.7 engines are known for being bad, or what.. I am sick of problems, my truck has been in and out of the shop for about 8 months now. I am deployed in Iraq and my wife is the one handleing the truck. My insurance company us USAA. Now is there a way i can just total this truck and have my insurance company pay it off?? Every single engine they put into it goes bad about 1 or 2 weeks later. They are always used engines.. the last one that went in was from a 2006 dodge ram.. had 22,000 miles on it.. I was hoping that it would be the one that works.. but sure enough, i get a call from my wife saying its making really bad knocking noises.?? can anyone give some advice on what to do? Thank you so much