SD Trailers RV's & Trucks operates from the Hwy 8 Business corridor in Lakeside as a trailer, RV, and truck sales and rental hub that also serves as a U-Haul Neighborhood Dealer for moving-truck and towing-equipment reservations. RV owners servicing their rigs source replacement parts, plumbing fittings, and 12-volt electrical components from Webb's RV Supply Inc. on Maine Avenue, which stocks a deep inventory tailored to the recreational-vehicle community anchored by nearby Rancho Los Coches RV Park. The lot handles consignment sales and direct purchases of travel trailers, fifth wheels, toy haulers, and Class A/B/C motorhomes, with Cruise America RV rental partnerships expanding the inventory for short-term vacation use. Truck and trailer hardware—hitches, wiring harnesses, brake controllers, and weight-distribution systems—sources through parts distributors including Autoworks Parts in neighboring Santee for tow-vehicle setup and integration. The Hwy 8 Business address positions the dealership on the commercial corridor that runs between Lakeside's mobile-home communities and the I-8 freeway interchange serving the Lake Jennings and El Monte recreation areas.