[jhautz]

1515/2.5D is a killer motor on 6s. PLENTY powerful for that application. Running higher kv doesnt necessarily give more speed. Speed is in the gearing.

All of those motors you mentioned will pull alot of amps on 6s. 60+ MPH and 30+ min runtime will be a hard combo to get with that big of a truck and 5000mah. With the 2.5D you can gear it up for the crazy speed, but then gear it down and get nice long runtimes as well.

Just my opinion.