I'm in the trailer market. I won't be building my own, so I'm trying to save about $7k for a CVT or Freespirit...
The trailer used to be on the "fantasy" tab of my vehicle build spreadsheet, but it's moved to the top with a bullet. Traveling with a kid (plus dogs) requires a substantial extra amount of crap, and her carseat alone takes up a huge amount of cargo space. We are technically able to fit everything (just barely), but it's a pain in the ass, and it takes a long time to get everything loaded and strapped down. By the time I'm done with the game of tetris, I'm usually pissed off and sweaty, and my wife really loves that. Needless to say, she's less keen to go camping for a night or two when she knows she'll have to suffer thru my bad attitude...
After that, undercarriage armor. After that, front bumper with winch, which may or may not require heavier shocks up front. After that, how about a snorkel, why not? After that...?