Aight, here we go:
1) injectors - get new ones, made by Delphi, you may want the G-code for the '93-'94 turbo applications as they supposedly give you a bit better throttle response.
2) injection pump - keep the good one you have now, yes it cane but turned up, but you can indeed burn holes in your pistons if you turn it up too much. Do you have a pyrometer (EGT gauge)? If you're turning up the pump and you don't have a turbo you really wanna have a pyrometer, as it's ridiculously easy to overfuel an naturally-aspirated engine.
3) turbo - you want one, especially for towing that 30-footer. Performance increase is significant, fuel economy apparently also improves somewhat. You wan a wastegated turbo, as the non-wastegated ones do not build up much boost unless under load.
4) stacks setup - dual 4" sounds like a good plan, look for a setup made for a '92-'97 truck, as they seem more popular in the aftermarket world. the '94-'97 trucks are PSD trucks, but bed dimensions are about the same, so whatever exhaust fits them should fit your truck as well. Also, have you thought of a single stack, like this:
And don't worry about water in the stacks, it will get there if you're running open stacks but it gets blown out the moment you fire up the engine. Downside is tho with water also comes off soot, my old turnout stack could blow that stuff good 10ft away so all my co-workers and friends were warned to not park on the passenger-side of my truck if it looks tis gonna rain today, my new stack tho I put a rain cap on it and while it can get a bit annoying at idle it works very well.
5) legal stuff - I'd imagine stacks will be okay in NJ, especially since tis a diesel truck, however you will have to have a muffler to pass inspections. Whether you really need the muffler is a different story, if you go with a turbo it really quiets down the engine, and having a non-turbo engine with straight through exhaust and a single stack I don't think that's too loud either. But, to keep it legal, yes you will need a muffler, so get one from a big-truck shop, or order one online but make sure tis made for a diesel truck.