Thermostat Replacement 2010 5.7

Hi....Tundra with 145,000. I have had it for 3 years with no problems. I am going to drain the coolant and refill (no idea of previous maintenance). I was thinking maybe do the thermostat also. The truck doesn't have any heat/coolant problems now. I just want to stay ahead of them.
Any opinions???

 

My opinion is if it's not broke, don't fix it. My thermostat is the original one and it's at 300.. Water pump is a different story, when it starts to leak buy your pump. Replacement is your discretion.