Hi.
The silence may be due to a limited number of people owning the Tunland, but also because of the more limited number of people knowing and reading this forum. 😉 I discovered it by chance (Google). You’ll find more opinions elsewhere (4x4community), and excuse me for mentioning a rival forum.
Anyway, I own a Tunland double cab, 4×4, since a year and a half, only 12.000 km because I don’t use it in the city. I’m satisfied with performance, frugal consumption and excellent price-quality relationship. These Cummins engine has proved to be great from 400 to 3450 masl, on roads and trails.
If you need more specific data it would be a pleasure to help you. Greetings from Colombia.