Not knowing what engine you have or the rear axle ratio I would say 5 to 6,000 pounds. This is assuming you don't have a S10 Blazer but a full size Blazer with a V8.
2.8 l v6
Looking for a Used Blazer in your area?
CarGurus has 744 nationwide Blazer listings starting at $900.
Search Chevrolet Blazer Questions
Chevrolet Blazer Experts