$1,500 is a steal for that equipment!!
Depends. My trailer has surge brakes, so I don't need the brake controller. I can back up just fine, so don't need the Backup Assist. I've never been stuck with the standard 4WD, rarely ever used 4WD Low, etc. Also, if you want to tow more than 6000#, you probably should have a WDH, anyway. So for me, the $1500 makes no sense. I'd prefer to hold on to the cash and get better mileage in daily driving.