That is exactly what we have. 2011 Pro4x with the RF sound system. I really have no desire ruin my stereo trying to learn to wire and especially adding a backup camera and having it wired to the steering wheel will be additional hurdles.
Thank you for the heads up on the nuances.
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Using the wrong harness wont wreck your stereo, it just sounds like garbage. What normally happens is a head unit has 2 outputs, the wire ones in the harness, and RCA plugs. The wire ones put out speaker-level outputs, which are designed to go straight to the speakers (basically louder), and the RCA are designed to go to an amp (quieter output) as the amp will boost the volume (usually better than the head unit). If you hook the speaker-level output to an amp, it does work, but the amp is just boosting the already-boosted signal, causing it to be really loud and distorted. This also means you cannot turn the volume up as much on the head unit, or it gets really loud. Mine came with an aftermarket head unit, and the previous owner had used the wrong harness, and I couldn't turn the volume up past around 5 before it sounded extremely loud and distorted.
If you do look at a head unit replacement, make sure they use Metra 70-7551 for the adapter. The one that the databases all suggest are for the non-RF system. Technically, that is all you need to get the stereo working in your vehicle, is to buy that adapter, possibly the replacement trim plating if yours has the front panel shared with the climate controls (Metra 99-7428B in grey or black), connect the wires on the adapter to the wires that come with the head unit (normally color-coded, can be done either with solder or crimps), plug everything in, and you are good to go. If there is buzzing and popping when you change sources, you might have to add a ground loop isolator (
https://www.monoprice.com/product?p_id=6909) between the stereo and the rca plugs on the adapter. Due to the placement of the RCA out on my stereo, I also had to use 90 degree RCA adapters, there is a steel bar behind the head unit that I had to clear for the RCA plugs.
If you want the steering wheel controls to work as well, you have to buy something like the Axxess ASWC-1 (make sure it is compatible with the new head unit), it is usually just 3 or 4 wires that need to be spliced in. This part is probably the most complicated as you have to figure out how to plug it into the factory harness, you can't just buy an adapter that clips it (or at least I couldn't find one). It usually involves cutting a couple of wires on the vehicle side and crimping it on to them.
