Its a 1996 39' monaco rv with a cummins 300 in it. when you put the sled trailer on the back she slows down a bit on the hills (like a lot actually) so she needs a touch more jam.

its all manual on that thing so i'm assuming just turn up the boost and modifiy the fuel plate?

 

You can slide your plate forward and add a boost elbow, the biggest problems with the 8.3(thats what it is??) with the fuel jacked are headgaskets and exhust studs,however you may never have a problem if you use your head when you drive it. The lack of fresh air in a RV's engine bay with alot of fuel, big load and a heavy foot will take its toll on the engine.