I've stayed twice and found them to be fairly accurate. To be safe, especially due to the fact that the access road is right in front of each site, try getting one that's deeper than your rig is long.

It’s pretty accurate. And the sites run right along the access roads, so if you are jutting out at all, you will (A) interfere with larger rigs coming into the sites or (B) won’t have enough room to back into the site with your tow vehicle.

Not sure about the lengths but we find the sites to be really cramped. The cactus grows right up to the rv!

They are pretty accurate.

Yes, they are pretty accurate. If anything, you would want to go longer not shorter.