Easy way to raise trailer's nose while hitched in campground

^^^
yup most RV's are anchored down to their sites where it would take time to move out in an emergency like you described. You did the right thing looking out for your camping neighbors. :C

If I'm not disconnecting the truck from trailer, I will crank the tongue jack a few inches if I find the trailer way-unlevel. Most times I drop the trailer jacks also as I find the trailer bounce annoying.

Mike