That is correct,
ALL travel trailers in the State of Oklahoma must be tagged with a
travel trailer tag. That includes 5th wheels, classic canned hams, the fiberglass behemoths, canvas pop-ups, Airstreams, etc. If you call either a state-licensed tag agent or go directly to the OTC offices on Lincoln and ask to tag a travel trailer, or describe it as a camping trailer, or a trailer you can sleep in... they will assume you need a travel trailer tag.
The question is: Is a teardrop a travel trailer? Some will claim it is, some won't. Some will claim that if you can sleep in it... then, it's a travel trailer. Some will claim that if you can cook in it.... then, it's a travel trailer. Some will claim that if it has anything remotely resembling a bathroom... then, it's a travel trailer. Some will say that if it has a temporary porta-potty in it... then, it's not a travel trailer. The potty has to be permanently affixed to the structure. I went down that road and round more bends and more bends until I got dizzy, threw up my hands and gave up. Even the Oklahoma Tax Commission couldn't tell me the definition details. Nor would they allow me to read their rules and regulations. To this day I believe it remains a grey area that is subject to interpretation.
Funny story: When first pursuing this I had a local tag agent tell me that if my trailer was designed for the purpose of recreation then it was a recreational vehicle that required a travel trailer tag! So.. I inquired about my dog boxes. I asked, "If I load my quail hunting dogs, in their transport boxes, onto a utility trailer for the purpose of transporting them to the field to participate in
recreational shooting and hunting... was I required to now tag the utility trailer as an RV? Wish I would have had my camera, the facial expression was priceless.
Bottom line: We Okies have three options.
a) Purchase a
travel trailer tag. This is the most expensive of the options and includes many bureaucratic hoops to jump through especially if it's homebuilt. The advantage is you carry a legal title of ownership. That may carry insurance implications, not sure.
b) Purchase a
personal trailer tag. This tag was designed for those wishing to display a plate on any type of trailer that isn't required by law to display a plate. In Oklahoma, that includes boat trailers, lawn equipment trailers, etc. Details are outlined above in this thread. Go to a tag agent with VIN # in hand, request a "
Personal Trailer" tag, pay them the $14 or so and walk out with a plate and sticker.
c) Go naked! Plate-wise that is...
Personally, I believe your risk of getting stopped on the highway is greater. Why risk it for $14? If traveling in Oklahoma only, you may be overlooked due to the lax tagging practice here. If traveling out of state, risk is probably higher.
Note: This is not legal advice, I'm not an attorney. It is just a summary of my personal experiences.