If it has the E-Locker rear axle it's more likely got the Max Tow pkg. If it's got 18" wheels (and a very distinctive wheel cover if you know what your looking for) and the e-locker its probably got the HDPP pkg. None of those are going to be readily apparent, but when i was shopping for a new truck, a lot of listings would say it had the max tow package. But, your chances of finding a truck (new or used), that has both max tow and HDPP are very, very slim.
The HDPP is the only way to get the more robust frame; and you have to have the max tow pkg to get the HDPP pkg.
