well, I was thinking....
If you'd have a teflon strip,about 1200x70x3,and you'd bolt that on the back of the springs....wouldn't that be great for protection of your springs?
You could just use some of the existing connection points to bolt it onto the back (=exposed part)of the springs,making the centre one fixed, and give the outer fixing points the ability to make the teflon "glide"...so the teflon should have some movement according to the flexibility of the spring...
the thing is you actually don't have to cover the whole spring,just the back and the sides have to be impact free...and since my springs are about 60mm on their widest point , the teflon(which is 70mm wide,remember?) would always take the hit on impact,not the leaf spring...
if it works it should be very strong&reliable and it should look way cleaner than bike tyres &/or loads of ducktape!,
what's your opinion?