what would you do tire pressure question?

Simple cross canceling tells me that you shouldn't put more than 325 pounds of stuff into the camper.

1045/80 = x/25

You should get more air in the tires though. Its not good for them to be running low on air.

About 70 psi should be right. With cars, the maximum pressure printed on the tires is not necessarily the right pressure, but on trailers, where there are no handling or suspension issues, typically you inflate to within 10% of maximum. Under inflation can cause the tire to come right off of the rim on corners and also causes the tire to heat up, risking a blow out. Also give consideration to the age of the tires. Trailer tires are not usually very high quality to begin with and if they are over 7 or 8 years old, they should be replaced. Last summer, I backed my boat trailer into the lake at a launch and a sharp rock pierced and blew out a tire. The tires were originals and were 7 years old but looked like new. It should take a lot more than a sharp rock to wreck a tire, but age did them in. Happy camping.

the tire is rated for that much weight at 80 psi so the tire manufacturer planned on it being inflated to higher pressures than 25-30 if your tires are sagging then i would add more air...some tires are filled to 100 or even 120 psi to handle the weight of the load on them...on this i would just fill them til they look right. you might get to 45psi you might get to 57psi, or any random number...but you dont want tires low on air, especially in a trailer with any kind of weight. the tires will heat up, wear out or come off the rim, and none of that is safe. 80 might seem like a lot but 25-30 is definitely not cutting it either....you just have to find your middle ground

If it says 80 psi use 80 it will keep the life of the tire and its what it is designed for and its much safer