the problem of wasps is not unique to TM nor should it be viewed as a Flaw in the design. Wasps (mud daubers) are attracked to propane smells. On our TM and now on my 5th wheel I have wire covers over the heater vent as well as the grating for the hot water heater. Propane is the attraction and if you have propane powered items you stand the risk of attracting guests. I would also consider a mesh for the TM fridge vents if you run your fridge on propane.
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