First, I will qualify my response by saying I have an Outlaw 29H regular Class C. Mine are located under the shower. There is an access panel on the sidewall beneath the base of the shower.
Your may or may not be plumbed similarly but if you see an access panel, remove it and look there. Mine were hard to find. It's not easy to get your arm in there (especially since I added some wood blocks to beef up the shower support) but that's where Thor put them.