Our '97 Hitchhiker II 31' with 2 slide outs--no leaks sitting in the rain or going down the highway. I has big wide rubber seals all around to keep out the water when the slides are extended and addtional bulb rubber seals when retracted.
We had a '87 Argosy(made by Airstream) 5th wheel with a living room slide out that would leak sometimes. That trailer had to be perfectly level and the stabilizer jacks had to be down for the slide out to work properly(design flaw & weak electric slide out mechanism). The Hitchhiker hydraulic slide outs work any time, level or unlevel, stabilizer jacks up or down. I usually get close to level and put the stabilizer jacks down before extending the slideouts.
Also, I squeege off the tops of the slide outs if there is a lot of rain water pooled on the tops of the slides after a heavy rain before retracting. I keep the slides waxed with Protectall Wax which makes big puddles of water on the tops since they are level. I treat the rubber slide out seals and the slide out support arms about once every 3 months with spray silicone which seems to help keep the rubber seals pliable were they "wipe" the slide outs when they are retracted.
Bill
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Y2K 3500QC, 6 Speed, 4. 10, SLT+, Camper & Tow Pkg. , Westin Chrome Nerf Bars, Mopar Flaps, Reese 20K Hitch, EGT & Boost Gauges, RPM 45 Gallon Aux. Fuel Tank, Highway Products 5th Wheel Toolbox, ECM Controlled PacBrake, Painless Wiring Kit, Mag-Hytec Diff. Cover, Rancho 9000, Air Lift 5000 Air Bags, TOYS: '97 Hitchhiker II 31' 5th Wheel, 2 slideouts, 19,750 GCW, '94 Lance 990 11' 3" Slide-In Camper, Torque-Lift Camper Tiedowns