I have turf tires. The max psi says 38 lbs. They are measuring at 18-20 from the dealer right now. I noticed while hauling firewood in my loader the tires were squashed alittle. I was surprised so I checked them. I figured coming from the dealer new a week ago tire pressure would be closer to max. What do you guys recommend? I will be using the loader a lot in the next couple weeks. Do I change tire pressure for grass cutting? Thanks