My rig has a Liftco slide. I'm happy with it. I did have a failure but attribute that to the builder using the wrong bolts in a critical part. Talking to Liftco they were very helpful and I was able to fix it and make it better. I give their customer service a "A" rating for that. My slide uses long threaded rod and a electric motor to move. I think I like that better than a hydraulic fluid type.
'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