A TDM with only propane tanks and a TAU. I think that would be a pretty interesting lab edition.
I choose the TAU because it would probably be the most accurate for blowing up a tank from a far distance.
Sounds good, how about unlimited propane tanks!
Imagine making a huge wall and then waiting for someone to cross and BAM!! a huge chain explosion!
It would be more realistic to make it only 5 or so at a time rather than unlimited, but still I do second this idea.