This is all really good advice. Thank you. For a minute there I thought I was reading a guide to woo a woman. I think you're on the right track.Comfort and convenience can be a bit of a trap. Too much of either beyond what is considered tolerable by a given person begins to erode or detract from the experience itself. It's that "tolerable" piece that differs among individuals. Those thoughts of "well, if I could just have this and maybe a little of that" start to creep in and before you know it, you're rolling into camp in a Van Halen tour bus! Having my wife and 2 kids aboard for most trips over the years, I fell into the trap about 10 years ago and bought a RV thinking that's the only way they would enjoy the outdoors/off road experience. Stressing about the size of that RV, the maintenance, black water tank, etc. I sold it pretty quickly and carefully/thoughtfully built up my gear that would all fit in/on the 80.
The shower and toilet seem to always be the "thing". The PETT toilet with shower tent has proven to work pretty well for us in every situation except winter camping, which we don't do...hotel is easy and cheap enough in winter. Try this one time before committing to an expensive trailer with wet bath and you'll have the answers you seek. Invest about $150 in a PETT toilet, shower tent, and solar shower gravity bag. Take your wife dispersed camping in a truly breathtaking and isolated spot. When it comes time to shower, have her put on a pair of shorts and bikini top. Warm up a large pot of water, add some really high quality fancy soap that she didn't know you bought, and have some small soft towels ready. Take some time and wash her feet, her legs, her arms, her hands, her neck, her back, then have her dip her hair in the pot and wash that. She can finish the rest with the solar shower in the tent.
If this is not tolerable, camping may not be in her blood and the novelty of a trailer will likely be short lived.