Tractors are risky at times. The average first aid kit is useless.
The leading cause of death for Americans under the age of 46 is trauma. 148,000 die every year from trauma. Natl Acad of Science estimates 30,000 of those could be saved by improved care and emergency services.
It is the Golden 5 Minutes. Most wounded/injured who die, die from blood loss.
If you want to save lives, learn basic first aid and carry first aid supplies. You can easily buy trauma dressings and tourniquets online. Examples:
R.A.T.S. Rapid Application Tourniquet System
Ever Ready Bandage Battle Dressing First Aid Compression Bandage, 6 Inch
SWAT-T Tourniquet, Black
QuikClot Advanced Clotting Sponge