I'm another very happy Tiger owner. Mine's an '06 CX on a Chevy 2500HD std. cab 4x4 chassis with the 8.1 and Allison 6-spd. Equipped with Onan, roof A/C, awning, oven, and tank heaters. Haven't had any serious problems, but only have about 27,000 miles on it. I did have to chase a water leak for a long time, but it was simple to fix once found.
I bought it as a higher-mobility RV, not an expedition vehicle. I've owned 7 4x4's since '72, and a Baja Bug. I've owned 2 other RV's in the past 6 years, both 19' Roadtrek Class B vans. The Tiger combines the virtues of both. It could even be an 'only' vehicle. The Tiger fits in the same-sized parking spots as the RT's, and has a heck of a lot more mobility. I've done a 500+ mile day in it, and regularly use it for day-trips. I've had it over 90 mph once briefly, and the 8.1 was nowhere near out of breath. I've added a Hellwig rear bar and Air Lift bags. Handling's pretty darn good; you don't even feel truck wind. Mine returns 11.5 mpg at 70+, 13.5 at 60-65... sort of useless info, since GM doesn't offer that drivetrain anymore.
Excellent factory service (I live 180 miles away). Everything is 'fixable' by any RV shop, as mentioned. They're now available on Ford chassis, too.
If I wear it out, I'll get another, unless there's some other option in the niche by then. I'd skip the oven, and do a solid floor instead of carpet. Add a few more 12V and 110V outlets (a summer project).
Jim H.