For the moment 30m lumber roadtrains are tested between Överkalix and Munksund. The project is called "En trave till" (One pile more) and is meant to reduce the number of lorrys on the roads, and be more environment-friendly.
A Volvo FH16, with a dolly, link and trailer is used in the test.
The train has a gross weight of 90t, but there are only 8-9 t on each axle.
http://www.trailer.se/news.php?id=4427 (In Swedish)