I lived and traveled full time 8 years in a 36 ft 5th wheel and heard stories of others being stuck somewhere with a broken spring. I purchased 1 spring that was made for my trailer and carried it for 7 years, never needing it. But it was there if and when needed. I let it go when I sold the trailer and let the new owner know it was just there "in case" he ever needed it. Most folks were not able to move the trailer very far when they snapped their spring without doing damage to the tire or bottom covering. It didn't take up much room and was a cheap insurance to allow us to get back on the road quickly if need be.