How long is your rig...really?

I usually say my 36.5 foot fiver is 36 feet. If they say they haven't got room I am willing to shrink it down to 29'.

I read the dimensions of the individual sites and pick the one I want.

In Yellowstone my previous 42' DP became a 40'. Doubt my current 45' will be able to shrink that much. :B

Simple question, somewhat complex answer.
Answer given to me several years ago by a Texas Highway Patrolman:

For any bumper-pull the LEGAL length is "tip-to-tip", or as some people put it, "it's shadow at high noon".
More complicated for 5th wheel. LEGALLY, only the length of trailer from back of tow rig bumper to outside tip of 5th wheel. However, since the rig is longer when unhooked, I find campgrounds like to know the length from tip of 5th wheel overhang to back tip of bumper.

Have never measured an actual RV measurement to length stated in manufacturer's specs. Might be interesting.

My 2016 38RL actually measures 41'5".. I say 42' when booking.. I do not want to get a site that I will not fit in..

Some campgrounds, I need to shorten my camper to fit into certain sites. I generally find that a couple foot discrepancy hasn't been an impact to my ability to park either truck or camper.

Never done that. Ours measures what it measures. Why would I lie about the length, get into the campground and find out I can't fit because they took me at my word?