Been 'vanning now for 8 months and just ordered my fourth tow ball cover. I lost the original which came with my towbar on my first trip! Today I towed someone who was broken down in a precarious position. Stupidly, I thought it would be alright to leave the cap on. Nope. It was missing when we stopped again. And my tow rope is knackered due to the wally towee panic braking. No good deed goes unpunished eh? I noticed the tow ball cap on Amazon was available on standing order on Amazon. I was temped! You'd think there would be one which just hangs from the tow bar when not in use. Maybe there is and I haven't found it.