I use an interactive adaptable reverse gear installed in my Bizzerkeley (aka: Wife).
It has yet to fail me under any conditions but I did here some grinding noises at Road Atlanta during the Mitty when the big storm came and we needed to back up a bit on wet grass......
BTW; can you make me a diff that will handle the 1000cc turbo - I'm living on the original Berk unit!
mgbmbzguy