From Chevy.com
BLAZER TRAILERING DATA
NOTE: Your vehicle may require additional special equipment to tow the maximum trailer weights listed here. The weight-carrying hitch limit for Blazer is a 3,500 lb. trailer with 350 lb. tongue weight. Weight-distributing hitch and sway control required over 3,500 lb. trailer weight.
ENGINE
TRANSMISSION VORTEC 4300 V6 AUTOMATIC VORTEC 4300 V6 MANUAL
Model Max. Trailer
Weight1
Axle Ratio Max. GCWR(lbs.) Max. Trailer
Weight1
Axle Ratio Max. GCWR(lbs.)
2WD 2-Door 5700 3.42 9500 4200 3.42 8000
2-Door Xtreme 2000 3.42 6500 2000 3.42 6500
2-Door ZR2 4700 3.73 9000 – – –
4-Door 5500 3.42 9500 – – –
4x4 2-Door 5400 3.42 9500 3900 3.42 8000
5400 3.73 9500 – – –
2-Door ZR2 4700 3.73 9000 4200 3.73 8500
4-Door 5200 3.42 9500 – – –
5200 3.73 9500 – – –
1 Maximum trailer weight ratings are calculated assuming a base vehicle, except for any option(s) necessary to achieve the rating, plus driver. The weight of other optional equipment, passengers and cargo will reduce the maximum trailer weight your vehicle can tow. See your Chevy Truck dealer for additional details.
NOTE: Trailer tongue weight should be 10 to 15 percent of total loaded trailer weight (up to 750 lbs.). Addition of trailer tongue weight cannot cause vehicle weights to exceed Rear Gross Axle Weight Rating (RGAWR) or Gross Vehicle Weight Rating (GVWR). These ratings can be found on the certification label located on the driver-side front door or door frame. Base cooling system includes all content required to attain maximum trailer rating. No optional cooling equipment available. Z82 Heavy-Duty Trailering Equipment Package includes weight-distributing hitch platform.
USING GCWRs (GROSS COMBINATION WEIGHT RATINGS) TO DETERMINE ENGINE, TRANSMISSION AND REAR AXLE RATIOS:
You can use your desired GCWR calculation to determine the powertrain you will require to tow a specific trailer with your Blazer. The last column to the right in the chart above shows the maximum allowable GCWR based on all available Blazer engine, transmission and rear axle combinations. The GCWR includes the total loaded weight of both Blazer and trailer.