I can say from experience, the RAM 3500 DRW Mega Cab has payload issues...I had one. Loved the truck, but when I traded up to my current 410LEV Raptor TH, the hitch (Pullrite Auto Slider), Pin Weight and misc stuff, I was way over payload capacity. So much as I was highly concern about legal issues if an accident had ever occurred. The truck would TOW just great, but major weight capacity issues.
This was a costly mistake on my part, as I had to go truck shopping...again. The RAM was to be my last truck...oh well! So I will say, please check the pin weight carefully of any 5vr you purchase.
Steve