You may have 2 leaks since they are coming from both sides of the rv.
Since the leaks only occur when using the shower or washer, then its probably a safe bet that the water lines are ok. Otherwise they would be continuously leaking when connected to the water supply.
For the washer, the drain is probably a flexible pipe which routes under the sofa to get to the grey tank. It could either be damaged or loose. In either case, it would only leak when the washer was emptying. If you deploy the sofa, you should be able to see the flexible plumbing components, including the drain line, for inspection. Another possibility is the washer is faulty.
Regarding the shower, you should make sure the water isn't leaking out past the shower door while showering. If the door is fine, then you can check the shower pan drain.There is a 6"*6" access panel inside the passenger side rear wheel well which provides access to the shower drain piping. It is tight a fit, but you can see if there is a leak.
Good luck.
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