this is for the 2007 model ram
Dodge Ram 1500
The Dodge Ram 1500 sparked the light-duty pickup truck market by offering legendary HEMI power with Chrysler Group‘―s fuel-saving Multi-displacement System (MDS). With the 5.7L engine and a 3.92 rear axle ratio, the Dodge Ram can tow 8700 pounds.
from another site using 17" wheels, 20" wheels would lower the tow rating
The Dodge was the perfect example of how much axle gear (ring and pinion) ratio choice can influence maximum trailer weight ratings. Our truck was delivered with the standard 3.73:1 rear end, and was tagged with a 7650-pound tow rating. A couple hundred dollars extra would get you the optional 4.10 axle, along with better acceleration and hill climbing, plus 1000 pounds more trailer-towing capacity. The increase in fuel consumption as a result of the higher-numeric axle gear ratio should be minimal under normal driving conditions.
Trailer towing capacities range from 2,900 pounds for the V6 to 9,100 pounds for a Hemi 2WD Regular Cab. A 4WD Quad Cab with the 4.7-liter and automatic transmission is rated to pull a 7,050-pound trailer with the 3.92 rear axle ratio. The available 20-inch wheels reduce towing capacity by about 1,000 pounds.
Payloads range from 1,200 pounds to 1,750 pounds. In short, if you tow or haul, compare these capacities before selecting a model. On automatic Rams, a Tow/Haul mode for the transmission provides crisper shifts and reduces gear searching for reduced heat buildup when towing.