This is a custom built trailer with 5' steel beams welded and painted black Dual torsion axles with trailer rated tires (five lug) each four stabilizer jacks (for site leveling) 2 5/16' ball hitch with heavy duty safety chain four folding doors to provide a 14' opening for forklift / tractor loading / unloading four solar operated fans to provide forced air changing four intake and four exhaust vents for efficient air change while maintaining internal thermal heat roll up baffles for various load configurations interior painted black for maximum heat absorption inside (max obtained was 180 degrees) (85 degrees outside) well insulated for heat retention internal temperature gauge external monitoring gauge for inside full south facing roof set at 55 degrees for optimum solar entry back roof is corrugated steel for long maintenance free life No electric or fossil fuels needed just 'good ole sunshine'