We often make custom cut "OVERSIZE" signs that will allow trucks to display around a protruding center hitch, or whatever the obstruction may be.  The example here is one of the larger openings I have seen a customer request, but every truck and every situation is different.  Should you have custom needs to Oversize Load, or Oversize signs then please bring them to Sierra Safety Company.  We also stock vinyl and mesh "OVERSIZE LOAD" signs in various sizes.  We have 3" / 4" / 5" magnets and bolts.  Beyond that you can purchase a complete Pilot Car Rack that we build.  We look forward to hearing from you.  (916) 663-2026