My personal favourite is the government pushing pollution control on trucks. The added cost to carriers is so large, I don't even know how to calculate it. All the unpaid down time...mechanics that don't even know what the exact problem is or how to go about fixing it. And don't forget that I am positive you get less mile per gallon with the EGR valve than without. I'm all for saving the environment, but it's no wonder people are remanning old pre-egr engines instead of buying new. I don't think brokers/customers would be very happy if we said "I need more money in the rate to make up for the $10 000 we just spent on a mystery pollution control problem that nobody knew how to fix".
Oh, sorry for the rant!