STR license loophole?

[Liliana Gala]

Im located in Colorado's front range and a total rookie! I'm interested in doing an STR out of an RV on my primary residence. There are about a dozen or so other STRs just like this in about an hours radius of myself. I even reached out to hosts on Airbnb, and one said to call the city planner to get my STR permit. But when I spoke to the city planner, she said rvs are not allowed to be used as STR. I know my city doesn't enforce STR tax to be paid (crazy!!), but they're planning to enforce regulations more strictly in 2026.

Does anyone know if there is a general grandfather rule with STRs? …Or can I assume these hosts are running their business improperly? 

Thanks in advance!