Some years ago a company sold collapsible supports for this purpose. They stabilized the trailer, but would collapse when overloaded to prevent damaging the trailer slide room. Haven't seen them advertised for a long time. Guess that speaks to their effectiveness.
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2000 Winnebago Ultimate Freedom USQ40JD , ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA. " My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
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