Typically a 16-ft modular ramp setup is long enough to create a load angle that will allow most cars and autos to be loaded. Of urse with the Heavy Duty Stepdeck Aluminum Ramps, loading up an excavator, dozer or fire truck is no problem. Heavy Duty Step Deck Ramps that are rated at 20,000 lb max axle are typically 18" wide or 20" wide.