You walk thru the doors of an ER and they fix you up no matter what. A large segment of population can't/don't pay so the hospital eats all those costs. Since the hospital needs to earn money to stay operational they pass those unpaid bills onto the folks who have insurance or the ability to pay.
Be glad you have an ER to go to. Our local ER closed down because of the costs associated with running a small rural hospital. So what once was a 1-20 minute ride to ER is now 1-1.5 hours....
Personally I would just stick with the current 23.1-34 rear tires. I don't row crop anything so wider is better for me. So if anything I would be swapping from a 20.8 to a 23.1.
You need to compare/measure the rolling circumference of your tires to the specs of new tires. Rolling circumference is the number you need to look at.
Just a quick glance and a 20.8-38 ranges from 213" to 218".
A 23.1-34 ranges from 209" to 213"
And 18.4r38 for 201" to 208".
None match up...
No wedding ring for me. As a farmer/mechanic/welder my hands are in a lot of hazardous places. My fingers are valuable so I don't want any extra risk to them.
I push the majority of my T-posts in with the bottom of the skid steer forks.
But for the occasional random post I still use the finger smasher 9000. Got a few scars on my hands.