I'm personally boycotting Best Buy for reasons I won't get into here (big customer service issue, probably doesn't apply to y'all). They're great for a local option if you want to see what you might be getting in person.
If you want another option, look at Crutchfield's. They've been "the big dog" for car stereos since back when stereos were cool upgrades.

The difference with them is they've got free tech specialists. If you pull your current stereo and get a good photo or two of the wiring you have (lots of RV stereos have two outputs, A/B, indoor/outdoor, etc) plus a measurement of where it's getting mounted, they'll help you pick out both the radio itself and the installation kit to wire it.
Installation kits are important because back in the day, installing a car stereo meant a lot of soldering and crimping, "making up" the radio harness to the car's wiring, and every radio and car was different. So a whole industry sprang up making pre-wired harnesses that have the bulk of that sorted out for you already. You probably know all this, but my point is that as a result of all THAT, nearly every major stereo maker stopped bothering allowing for details like this in their own products. Most folks never used the loom that came with the stereo anyway. So nowadays they all just have "pigtails" with no connectors on them at all and you are back to having a day of soldering or crimping to use them. But there are wiring kits that do have generic RCA connectors on them and Crutchfield's can probably help you identify the right one to get.