I tow a 24' toy hauler camper all over with a 350/4l80e/4.10's. Being a toy hauler, the camper seems heavier than most.
I added jba shorty headers, it has true duals, BB tune. It actually does really well if you keep it in the 2700-4500 rpm range. I have seen 100 mph while towing that camper. Boost would be nice, but not sure it is needed. I tow the same camper with an f150 Ecoboost, and am familiar with the concept.
I've never had a 6.5, and we don't know what camper you are pulling, but only being able to do 45 mph seems wrong.
I added jba shorty headers, it has true duals, BB tune. It actually does really well if you keep it in the 2700-4500 rpm range. I have seen 100 mph while towing that camper. Boost would be nice, but not sure it is needed. I tow the same camper with an f150 Ecoboost, and am familiar with the concept.
I've never had a 6.5, and we don't know what camper you are pulling, but only being able to do 45 mph seems wrong.