We've used #35 chain for 5 years. We have never had a drivetrain malfunction and only need to adjust chain tension once during a regional. That is probably because we don't get much practice time in ahead of time and things are just getting seated
One thing I like about chain is that it's easy to add or remove links to get the right length. When we can do it, we position the gearbox between the front and rear drive wheels (4 wheel drive). This keeps the chains short, which helps with weight and reduces the effect of chain wear. Chain tensioning is done by placing shims (washers) under the gearbox where it mounts to the frame. Very simple, very sturdy.