When a tire has a maximum pressure rating of 80 PSI printed on the sidewall, it is a pressure designed to be safe for the tire. The maximum ratings specifically say "cold" on them. So, if it says 80 cold it can and will safely handle pressure increases due to heat. Think a minute about your position. If 80 is the absolute maximum then you could never fill it to 80 because it would be over than once the sun hit the street. You would always have to stop and release some air to keep it at 80. Is that what you are saying?
Yes, I am "over tired" on my trailer. Airstreams suffer from harsh rides. My system allows me to run a tire with a little give in it but at the same time can handle the load. Works for me over 9 years and more than 40K miles.