After 3 years of ; 4 months at a time ; use the frame work of my sofa/ bed started to sag and I fabricated something similar to what you have pictured to support the frame work and firm things up while using the sofa. So if it looks home made , I'd think the PO was trying to address the same issue, sofa sag.
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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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