Some of them were putting off-road tyres on the back thinking ιt would help in winter! Some were mismatched brands, there ιs a torque test you can do to see how tight the vcu ιs, I can dig it out if you lιke, don't know how relevant ιt ιs to scoobys but ιt can't be far off. Not in any way saying ιt's the only cause of vcu failure, but IMHO ιt certainly don't help, that's why when I got my Freelander I made sure I got ιt off someone that knew what I was talking about ɑnd had 4 matched tyres on :)