i just replaced all of the insulation and the coroplast on the front of my 3455SA and it was very easy to do by myself with the help of a couple of jack stands laid on there side to push up the channels that hold up the coroplast . still sags a ;little in the front and rear where there is no channel. looks like new. I could only find white coroplast but it is on the bottom so no problem. got all material at home depot
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