Just talked to the hitch installers, and as luck would have it, he had just been on the phone this morning to Hidden Hitch about the '13 RAV. Hidden Hitch says the 70785 Class 3/4 will definitely fit the '13 RAV. However, there is a good possibility that the 90207 Class 2 will fit. He said it would take about 1/2 hour to install and the installed price is $260, with no wiring. That's a far cry from the almost $1300 that Toyota wants for the installation of their hitch, with wiring of course. I know you're in the same boat as me, no wiring needed for a bike rack, but the guy did say the wiring for the '13 RAV is totally different, and he was very unsure of the cost and complexity. He did say the earlier RAV's needed extensive wiring back to the battery for their trailer plugs.
I'll likely try to get the 90207 installed within the next few weeks. They also said if the 90207 won't fit, they won't charge me for any of their time.