For camping and her daily driving, particularly if she likes it, you didn't make a mistake. When driving difficult trails is more important than camping, there are much easier and cheaper approaches to make a serious offload vehicle than hacking on an LX.
I left my LX alone and never regretted it. The LX is pretty impressive offload stock. The AHC really does work. It gives you a lift when you need it and a great ride on the highway. Great truck for camping out of. I got a LC the 2nd time around and do miss the AHC at times. The LX with AHC is a better ride on the highway and probably is more capable off road (stock).
The molded stock side sills are a problem if you want sliders. No idea how hard it is to put on the LCs side sills in place of the stock LXs, but that would be the way to go if you have to have sliders on a LX. Personally I wouldn't do a big winch bumper without some sort of lift. It just makes the approach angles a problem and adds weight. A LC/LX is pretty big off road as it is. Adding a few inches in bumpers would only hurt on any trail you could drive with a stock suspension, unless you really like to drive by brail. But I think sliders are the most important addition one can make to a truck and might be worth some effort.
I scratched every rim, from 15"-17", I've ever run off road except for the 20's on my old LX. I'm sure driver attitude is more important than size. And I remember the exact same discussion 10 years or so ago about running 17's vs 15's or smaller. That said, the stock tires are pretty lame even on fire roads. Replacing them with a decent AT isn't a bad idea. I managed to take out a stock sidewall on a well maintained fire road after hitting a small rock at speed. I don't think a decent AT or MT would have noticed.
The third row seats eat space camping, you probably want to pull them, (beware the holes that are left), but other than that, get out there and enjoy. When stuff breaks, gouges or dents, well then you know it is time to upgrade.