Barker Manufacturing Company 31340 Universal Slidewinder
One size fits all slide out rooms and protects your slide out room while extendd for long periods of time. Each side winder adjusts from 19" to 47" above ground, with cradles that fit slide out tubes up to 4-1/4". The heavy-duty steel construction is powder-coated and zinc-plated to resist corrosion. Static Load Capacity: 5,000 lbs. Full two-year warranty.