Hey Neil, any chance in the near future you can come up with a set of spring retainers for the rear. If i get you disco's the added articulation runs the risk of the springs coming off of the perch.
There are some cool designs on expedition exchange.
http://www.expeditionexchange.com/retainers/
I know these may be a tiny bit over kill. but the peace of mind is nice. I guess I could always get limiting straps. But they are ugly.