last one i saw was a custom built job
most trailer builders could mock up one, that would give you the control on just how you want it and possible future autos or boats for it to carry
i would talk to your local companies
our auto hauler was semi custom and the local guy was easy to work with
USN Retired, Life time member of the DAV.
Enjoying the 2008 Damon Tuscany 4056, no your eyes are fine, there are 6 slides