That would be a good location.
Basically you'd want a somewhat outdoor location that would get close to ambient that was protected from sun (and probably wind).
The battery bay under the step wouldn't be a good one as you'd get residual heat/cool from the coach and the battery will also alter the temp.
I'd also try somewhere under the rear of the coach--away from the genny (if yours is in the rear) and away from any "spray" from the rear wheels.
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