I have not done this. I added a cabinet behind my toilet. But I believe the reason the toilet is so far off the wall is the frame rail messing with the drain if you went father back. So I think the hardest part would be getting the drain to go into the grey tank. But you should be able to sneak in under the shower/tub and tap in somewhere in there. And if you only wanted cold water you could tap into the line for the toilet. Not a bad idea but execution might be tricky.
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2018 Octane SL 161, custom cabinet in living area and bathroom, toolbox added to tongue, equal-i-zer
2014 Ram 1500, air lift 1000HD, leveled
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