Often times when we travel our destination is several days away. To save money we boondock. Since the places we stop at have no hookups we rely solely on our own water supply and generator for electricity.
Most Wal Marts allow overnight stays. We park on the outer edges of the parking lots so as not to interfere with their customers.
Along any interstate there are also waysides/rest stops, some of which even have 24 hour security. We have found out that some of these stops have lots to park in away from the interstate. With the interstate you have continuous road noise. If you find a wayside with (off road) parking the road noise is greatly reduced. Of course you have semis coming and going but it is still less noisy without the constant traffic of the interstate. We are starting a list of rest stops which we have found which have overnight stays away from the highway.