Googled for Damon Daybreak , because thinking it was a Travel- Trailer or 5th wheeler, because you only gave GVW.
Apeared thoug to be a motorhome, as you would expect in this part of the forum.
Sorry I am from Holland Europe so am not familiair with the different brands here used.
But to react on your question , dont use American made Pressure/loadcapacity lists, they are made with a formula that leads to to much deflection in the lower pressures. Goal of all calculations is to keep the deflection the same for the lower pressures as when maximum load and AT-pressure on tire.
The logical calculation most people tink is logica then is even better and comes pretty close to the ever to be constucted ideal formula to laws of nature.
I detemined my own universal formula , from wich official used and an alternative of an American IR J.C.Daws can be made by placing other construction load and power. Logical formula is same as using power 1 wich is the same as no power, and construction load zero . Also you can refine that formula by first substracting 100lbs a tire from maximum load of it and asumed real weight on it ( or GAWR/number of tires). That 100 lbs is average part of the maximum load that is carried by the construction of the tire, wich I babtised "construction load Lc".
Will include a picture of different calculations and at the bottom the "on the road methode, wich is also pretty simple and even closer to natures law.
But if you can give more data , I can calculate a save pressure with some reserve, using the GAWR's and GVWR of your motorhome.
Best would be weighing per wheel(pair) , second best per axle, but as long as you did not do that ,we can use those going from the idea that you are not allowed to go over that by law.
Copy text I used for other topic to show what I need from motorhome and tires. copyd it for general use so can be a bit off the subject here.
Tirepressure advice is all about load on tire and speed ( and sometimes about alighnment - camber angle).
So if you can give details of car and tires , I can calculate an advice pressure with some reserve for things like, pressure-loss in time, unequall loading R/L, incidental extra load, misreadings of pressure scales,and misyudging of weight, etc.
This is from tires next and can be read from sidewall:
Maximum load or loadindex.
Kind of tire to determine the AT-pressure/pressure needed for the maximum load up to maximum speed of tire, or if lower 160km/99m/h/reference-pressure, wich is not the maximum pressure of tire.
Maximum speed of tire, most given as letter ( Q=160km/99m/h,N=140km/86m/h fi)
If you have offroad or tires looking like that , with large profile blocs that cover a part of sidewall, also mention, they are allowed lesser deflection then a normal road tire, then the tire maker used to determine the maximum load (to my conclusion the case for the Bridgestone tires on Ford Explorer in the Ford/Firestone affaire).
If you cant find all of it give sises of tire and Loadkind, then I will google for it.
From car next and mostly can be found on same plate as the original pressure advices:
GAWR and GVWR ( Gross Axle/Vehicle Weight Rating)
But best would be to determine the real weights in your use on seperate tires or estimate it as acurate as possible, by weighing per wheel(pair) or axle.
Maximum speed , you dont go over for even a minute in your use, eventually different for different situations, for instance when towing or fully loaded.This apart from trafic regulations, if you drive faster then allowed give that speed. Nature punnisches with tire-failure, police only with a penalty.