I'm trying to get away from anything too heavy, or with bits to go wrong as I want to leave it attched to the trailer, which I tow with 2 different vehicles. I wish I had a bit more time to design one myself

, as manufacturing it is no problem, I've got all the gear for that. I like the idea of the easy lift one, and its alloy too so no weight. I thought about how you could stop the unit slipping on the road .. basically its a grip/slip problem with weight transfer being the key, and I think I can get around that easy enough, different base surfaces would defeat it though, ie definately not sand or a grass verge, but if your tyres humped anyway, you should be able to tow to a suitable surface