Go Mushing 

ManMat's Tow Line Bungee is designed to be extremely durable, and is covered with a protective sheath. 

It is designed to reduce and absorb shock when using a 4 wheeler, 3 wheel rig, training cart, scooter or sled.

Comes in a variety of sizes

S = 2-4 dogs
M = 4-6 dogs
L = 6-8 dogs
XL = 8-12 dogs

ManMat Tow Line Bungee