A refurbished 1972 Boles Aero XL travel trailer is listed for sale in Fresno, California, for $25,000 USD. The trailer measures 29 feet 1 inch overall and features a polished riveted aluminium shell, sleeping space for four, a four-burner stove, an oven, and a refrigerator with a separate freezer. Boles Manufacturing, founded in Burbank in 1946, built aluminium travel trailers until 1980 and reportedly produced more than 18,000 units.