Dayle1,
My TH ramp door had only 2 springs when I bought it last month. I ordered 2 more from Lippert and installed them yesterday. I don't have any toys, so I only use the ramp as a patio deck.
The installation of the two extra springs were very easy, so if you need to remove a couple(so your door settles on the ground), it will be just as easy. If you do, remember the reseal all of the outer portion of the hinge plates, where it contacts the door with clear sealant. Geocel GC28100 ProFlex RV sealant is what I used. It can be purchased online at Walmart.com