Not sure how much reinforcement you could do underneath, welding cross braces would probably be best but could be pretty expensive, l don't own a Vibe, mine is a Flagstaff, l am going to overlay my floors with a laminate floating floor, l tried a couple of pieces of laminate locked together for trial and it helped the weak spots, just have to make sure my slide outs don't hit. Also will have to adjust a couple of drawers. Bedroom and bathroom floors are OK, just the main living area.
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