We’ve fortunately had no problems running on 8” wheels but we do trail at minimum weight. Our first set of tyres lasted around 3000 miles over 2 years. In April this year I had a new set of tyres put on – the garage commented that the old ones were ‘only 4 ply’ and the ones they were putting on were ‘6 ply and will be much better’. They also assured me that the new tyres should be kept at 70 psi which sounds a lot but I assume they know what they’re talking about. Since April we’ve done over 2000 miles on them and happy to say hardly any wear so far.