Yea they are um slow, I even tried to send them sms in Checkish. Ill ask to see if my Polish friend got some friends from work that might speak Checkish?I tried to but as you already mentioned, theyre not too great on customer contact, so I ended up buying parts somewhere else. No other experience with them, have written them off for doing business myself. Ofcourse going there in person is likely to give a completely different view on this.
Signs for the truck being really fixed would be the amount of oil leakage, the condition of the air piping, the slack in the brake cylinders and the thickness and condition of the brake shoes (there are inspection hatches on each brake), also the state of the 100+ grease nipples, and the wear of the belts on compressor and alternator. Plus a ton of other stuff ofcourse.
And don't accept with just checking it at their parking lot, get at least a 50km drive and then check again. I can clean my truck into showroom condition too and no leaks will show... untill it's done a little distance.
Good advice as always, yea id bring a good lamp and clothes that can be dirty and crawl under over and inside the truck, looking at every thing, see how many friends I might be able to force, um "ask" to come help me check it out hehe.
Some good news is that I asked a fellow Swedish that drove from Sweden to South Africa, and they said that the price for diesel is very very cheap (sorry not in a Tatra but in a small VW buss). So might not be impossible as id thought. Just the mechanics, and land mines, and robbers and customs and police that want bribes and so one But that's life in Africa as usual.
Sorry if I gotten of topic a tad, its it Tatra related, just not soo mechanical, yet