Whenever parking for more than a week you should inflate the tires to tire sidewall max. This applies to any type tire.
If you read the material list on the tire sidewall and see "Nylon" this becomes a MUST DO if you want to decrease the amounut of flatspottingin the tires.
Retired Tire Design Engineer (40 years). I write a blog on RV tire applications www.RVTireSafety.NET and give seminars on RV tire application across the US. Serve on Technical Advisory Panel for FMCA.