In addition to the advice and experience that the others have provided, I'll add this information.

I have towed heavy with the stock turbo (ST) w stock injectors, ST w 160/0's, ST w 160/30's, KC38R w 160/30's, and KC38R w 175/80's all on a stock intercooler and w/o H20 injection: not knocking it, I simply have no personal experience with it. 0% and 30% nozzles are overprescribed and overrated. The addition of 80% nozzles has singularly contributed to the largest decrease in EGT's of any upgrade so far due to the shorter FIPW that is available with the larger nozzle. P.I.S. can add 80% nozzles for less than $600 or you could DIY with the tools for a bit less.

Gearhead has/had the best "commercially" available tuning.

Having stated that, I am MUCH happier with the results of my current tune writer: better starts, cleaner/smoother/quieter idle especially when cold, cleaner burn/less black smoke/lower EGT's, more linear throttle, smoother shifts, and small MPG improvement, all on his first attempt...I'm waiting on those to become commercially available before I tune my second truck.

I agree with Andy on the boost leak issue unless the frontal area of your camper is huge or you have some of Gearhead's most recent tunes.

 

There is a long list of folks waiting for those tunes to become available. Glad to hear the results are encouraging so far.

 

I haven't checked since I put the van turbo on, but I can build over 30 psi so I am pretty sure that I don't have any leaks.

I have always thought my truck has run a little hot. I have even had Matt adjust the tuning to compensate but it hasn't helped.

 

After a lot of research in the past I would agree that the 30% nozzles are overrated they were suggested to my my Matt and the injector builder. I may try different nozzles some day.

I did not know that Cody was tuning for people now. I thought it was only for special people like Rich "Tugly". I would love to try his tunes.

Also this is a Truck bed camper not a trailer. So it sits up in the air about 10'. I am sure it catches a lot of air. As far as power is concerned I cannot tell it is back there. I am able to pass whenever I as long as I drop out of overdrive to keep temps down. However I will be pulling a boat at times that weighs at least 5k so we will see what it does when I hook that up. I am not concerned that it cannot handle it, i just may have to slow down to keep the EGT gauge happy.

If $$ wasn't a factor I would do 80% nozzles, larger inter cooler and water injection.

 

The boat might sit lower, & probably much more aerodynamic than your camper. Anytime I tow weather tt or 5er it doesn't really matter, you are pulling a wall behind you & the wind resistance at 70 mph is rough especially with a headwind. No matter what I do I always get between 9.5 & 11 mpg depending on head /tail winds & my foot. Try to keep your speed at 68 mph, this is the sweetspot for my truck, anyway, pulling the 5th wheel & the truck (egt wise) is happy there. And don't worry about 1000 to 1100 egt temp at all