What is your preferred dyno of choice?
Load cell dyno capable of at least a 5 second sweep. The big roller Superflows with dual absorbers work very well. The problem with most dynos is the bigger builds just overwhelm the dynos ability to hold back the engine. You end up with 5'th gear runs to give the dyno a mechanical advantage, but that is a weak gear on a lot of trucks for tuning and mechanical reasons.