ONTHRD?

We recently purchased this 2019 Winnebago Travato 59K and are about to get it registered. We will get a vanity plate for it, and since we plan to take a cross-country trek in it next year, we may have it read ONTHRD. Faithful readers will know what that means. It could be misinterpreted as ON THIRD, but then it's good to separate the true Kerouac fans from the rest. I'll know by the reactions of passing motorists. Thumbs up means they "get it."

P.S. Another idea is JAPHY. Which do you prefer?