I know a lot of guys run decks on half tons and they may be just fine. And if you feel inclined and safe to run one then go ahead. However I think that every time this thread is brought up there should always be one disclaimer. If you get into an accident and you are over GVWR your insurance has the legal capacity to not cover you or your passengers. And despite what some people tell you there is no way to change GVWR that is on your truck from the factory. No 10ply tire or airbag will change that.
Not trying to start a pissing match, but clear up a misconception. Ask this same question to your insurance company and I would bet you a beer that they will say if you are under 10,000lbs. then you are good!
Operating safely and operating within the realm of legality are 2 different things!
Does this look overloaded or unsafe to you?