This is the solution I ended up settling on. I can't think of any other use-indexed item for a vehicle that you can tax. It fixes the ridiculous registration pr

This is the solution I ended up settling on. I can't think of any other use-indexed item for a vehicle that you can tax. It fixes the ridiculous registration pricing for people who rarely use their vehicles. Fixes the odd taxing of high capacity trailers. Fixes the indexing on damage caused to the roads as you mentioned. The only real downside I can see is it puts pressure on drivers to not replace old unsafe tires