I got this info from a poster on DodgeForum. I recommend you double-check his info, but it sounds about right:
"According to the '07 American Camper Association trailer capacity guide, a 2007 Dodge 1500 Q-cab with the 4.7 and factory tow package and 3.92 gears is capable of towing 7650 lbs. if it's a 4x2 and 7450 lbs. if it's a 4x4.
Conversely, the same truck with a Hemi is 9200 lbs & 9000 lbs. with the same gears."
Answers
"According to the '07 American Camper Association trailer capacity guide, a 2007 Dodge 1500 Q-cab with the 4.7 and factory tow package and 3.92 gears is capable of towing 7650 lbs. if it's a 4x2 and 7450 lbs. if it's a 4x4.
Conversely, the same truck with a Hemi is 9200 lbs & 9000 lbs. with the same gears."