We have an 09 with the TC certificate, tow package, snow prep, max GVW.
This was an Northern off the lot vehicle. We don't have dual alternators but with the snowplow package there was an high output alternator as opposed to the standard.
I believe the TC cert was a freebe since the other upgrades surpassed the requirements for it.
As far as I know at that time there was no 7 pin outlet in the bed but both 4 and 7 pin near the receiver with the Tow Boss package. Newer trucks with the factory ready fifthwheel puck setup may have one.
We do have heated seats but try to stay in places we don't need them but the few times DW has used them we have had no known draw on the batteries. We also have the electric cab heater again no problem and if in a cold climate well worth having.