Found this information, and just wanted to post it here as I've seen a few threads ask/mention about it....
Crew Cab / Long Bed Wheelbase (in): 168.5"
Crew Cab / Short Bed Wheelbase (in):154.5"
Extended Cab / Long Bed Wheelbase (in):155.5"
Extended Cab / Short bed Wheelbase (in): 141.5"
Regular Cab/ Long Bed Wheelbase (in): 131.5"
Regular Cab / Short Bed Wheelbase (in): 117.5"
Crew Cab / Long Bed Wheelbase (in): 168.5"
Crew Cab / Short Bed Wheelbase (in):154.5"
Extended Cab / Long Bed Wheelbase (in):155.5"
Extended Cab / Short bed Wheelbase (in): 141.5"
Regular Cab/ Long Bed Wheelbase (in): 131.5"
Regular Cab / Short Bed Wheelbase (in): 117.5"