Well now, is your head spinning from all the numbers ?
The numbers may look like they came from Vegas odds makers but I'll make it easy as some others have done.
Get your E rated tires and have them mounted and balanced with new valve stems (bolt in metal stems are best). The installer should check the rims for max pressure of 80 psi but remind them to check it. Also research your specific rim for how it needs to be balanced, lug centric or hub centric. Search the forum and www on that for more info.
If you don't have av TPMS buy one. Again search it, lot's of info out there.
Now go enjoy your camping!
This is just my advice from someone that's pulled boats, campers, utility trailer, and farm equipment (in my youth, long before I was old enough to get a drivers license) for 50 + years.
YMMV