Drive by Lincoln Park two to three hours after sunset.More often than not you’ll find the new group picnic shelter that the city wisely decided to keep lighted at night in use by Manteca’s most invisible residents — the homeless that don’t get in your face.Don’t confuse them with panhandlers you see during the day plying their trade at the entrances to parking lots, freeway entrances or with their makeshift Winnegabos partially blocking sidewalks. Besides the fact that some of the panhandlers commute to Manteca to beg, the odds are most of them aren’t homeless in the sense they are sleeping on the street.Those that make their way to the picnic shelter to kill a few hours before scattering to bed down for the night are homeless. They travel light.