One of my neighbors in the Longtown area does dock/hoist repair.
Shawn O'Brian - Docks 'n Moor - 918-519-2509.
Or you could call one of the HH dealers on the lake (#9 Marina or Eufaula Cove Marina) and see if they have any recommendations.
And, yes, you can easily change the bunk configuration for any style boat.
Good luck.