The author chronicles her time embedded in a pool of transient older Americans who have taken to the road in late-model RVs, travel trailers, and vans, forming a growing community of nomads, migrant laborers who call themselves "workampers." The end of retirement? -- On frequently traveled routes between seasonal jobs, Jessica Bruder meets people from all walks of life: a former professor, a McDonald's vice president, a minister, a college administrator,...