FYI, posting your ad in
< NyanCat >
the wrong category is also a form of "lying" so you may wish to consider how such advice would be contradictory.
Whether one has to pay or not does not change which is the correct category for an ad.
The only correct category for camper trailers is the "RV & CAMPERS" category.
https://forums.craigslist.org/?ID=318655525