I'm not familiar with your coach so I'll leave it to those who have your make and model or similar to respond with specific instructions.
As I look at the rear of your coach in photos I've pulled up, it appears that your taillight bulbs will be accessed from the rear and not by removing the lens/cover, just as would be necessary on many passenger cars. Therefore, you're right, don't start prying on the exterior of the assembly.
Both bulb changes and the removal of the entire assembly itself most likely will have to be done from the rear of the assembly.
Pictured below is what I believe to be your assembly. From that image, you can see that the front of the assembly is sealed (lens portion) and to actually remove the assembly, you can see the mounting tabs that would be on the inside or rear of the assembly itself.
So at any rate, to do a bulb change, I'd explore how to access the assembly from its backside. So open your rear hatch and see what you'd have to do or what you'd have to remove in order to have access to the bulb socket. Or you may even have to access it from underneath the coach ...kind of like if you were changing a headlight bulb in front.
As in other applications, most likely, the bulb assembly will pull out of the socket with a twist from the rear of the main assembly where you can change the bulb and then reinsert the bulb assembly back into the socket on the backside of the tail lamp assembly itself.
One word of caution and others with more knowledge can elaborate is that if you are changing a bulb/bulbs that function as turn signals, you'll want to research either wiring in the needed resistors or buy a more expensive LED bulb that will have the resistors built in. Again, there are threads here and on other automotive forums about changing to LED bulbs and those with more knowledge than I have will give you more guidance on this.
The other avenue you may want to explore is to change the entire tail light assembly out for one of the after-market ones that have all the LED bulbs already installed and integrated into the assembly. As soon as you find out what vehicle your assembly is from as most motorhome manufacturers back in that era of the mid-2000s used head and tail light assembly from passenger cars/trucks/suvs, etc., you can then shop for an aftermarket assembly. If going that route, most likely it will be plug-and-play and you won't have to worry about resistors or diodes.
Again, I may be way off-base so let's see if anybody that's more familiar with your coach can help you further.
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