...not...difficult to prevent rodents...Travel with a cat or a breed of dog that loves to hunt rodents...carry two sizes of rodent traps for mice and rats.
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a)
We have Heelers.
The rig has zero rodents.
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b)
We use bacon grease on the trap trip.
We handle traps with latex-style disposable gloves to avoid/reduce leaving our scent.
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c)
For ventilation and light, I mounted 3010 (three feet wide by a foot tall) sliders designed for a stand-still house in our 40' semi-trailer conversion.
Similar to the rig, these are about eight feet above pavement.
We noticed a hole in one screen, initially considered small birds nesting inside.
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Nope.
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As I was standing on the ground six feet away looking up at the window-screen, a yuge Black rat climbed out, followed by a second.
Those gymnasts:
* clung to the exterior window frame by their toe-nails, then
* launched onto the roof rail using only upper-body strength, grabbing it with their toe-nails, then, swinging for momentum,
* they flopped up onto the roof, then
* scampered across the roof, then
* dropped onto the porch chain, then
* ran across the deck, then
* jumped a couple feet onto the tire, then
" climbed face-down around the tire,
* and ran into the grass.
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The entire trip took them about two seconds, plenty of practice.
Several times, each rodent stopped to look me right in the eye standing six feet away.
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I rarely get angry.
That arrogance pushed my switch to 'furious'.
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I smeared bacon grease on twenty rat traps, and placed them inside.
Results:
* next morning, seven executed rats.
The kicker:
* each corpse was a fuzzy skeleton.
The survivor(s) cannibalized Uncle Fester and Auntie Morticia.
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Here is the window and screen pre-vermin: