The screens wouldn't do much on a 3150 ... the large wooden louvers under the refrigerator are open to the same area that the vents under the steps are ... then you'd have to stuff some steel wool in the gaping holes under the kitchen sink and bathroom sink where the plumbing is routed as those areas are indirectly open to the same area under the steps as well. The wall on the rear of the cargo bay seals nothing at the top between floor joists nor at the bottom down into your holding tank area. Ya just can't win here ...
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