Hugo Castro rubs his temples before joining the sea of evening rush-hour traffic that snakes all the way from San Diego to the Mexican border. The beat-up Jeep Cherokee he drives has 290,000 miles on the clock and is crammed with donated goods – sacks of rice, nappies, first-aid kits, chicken stock and T-shirts that arrived from a donor in Indiana that morning – that are destined for migrant shelters in Tijuana. “A lot of the migrants we help came recently with the caravans from Central America,” he says. “But some are people who were deported [from the US] years ago and have nowhere else to go.”