I found an Optima coach for sale on RV Trader. Looks like it's got an HWH slide on it. They're still in business in Iowa. I had HWH leveling jacks on my previous motorhome and they were good about rebuilding one I sent to them that was leaking.
'03 Freightliner FL112, 295" wheel base, with '03 United Specialties 26' living quarters, single screw, Cat C12 430 h/p 1650 torque, Eaton 10speed , 3.42 rear axle ratio