So I've had new tires on my gasburners, had them mounted with tubes... Been like that on my fuchs for years, never had a problem... I know it's not the best option though...
And now after about 200km, there was a leak around the valve stem of the tube and the tire went flat... So, is there another solution than tube in those? A special stem?
I have larger stems in my wheels, think the guy who put the tyres on referred them as "truck stems"

No leakage so far with Gas Burners.
I was going to try inner tubes with the Fuchs on the other car just to be on the safe side. But what caused the tube to leak in your case? Just old tubes?