I watched several videos of your channel and as an ex-bus driver I can feel the difficulties to find a parking place to rest. For the 5 speed Allison transmission, it is possible to enable the 6th gear by flashing a new software to the transmission control module, either on-site or remotely done. While it may increase the resell value of the bus, making cruising easier and unlock the speed limiter, I think it is rare for this bus to run on highway in the future.....