Tandem Axle Suspension
- 10k lb . These go up to only 14k.
Axle or Kit
- 15k - electric - $3200 
- 15k - $2500 
- 20k lb axle kit - $8.4k 
- 28k lb axle kit - dual tandem - 
- Base cost of $750 for 7k axle - no wheels or mount kit
- $3k for 14k trailer axle set. Electric brakes. 
- $500 for 3.5k ,no brakes 
- $1354 for 7k with brakes 
Kit - Wheels, Springs, Etc
- Even an F150 can pull 14000 lb  on a ball, not even gooseneck.
- No special license if truck is under 26k lb