Methanol or anything else introduced to the air system of a truck is not desireable. I think some mfrs even void warranties? like Bendix or WABCO.
There is no excuse for not maintaining your air system with a properly functioning air dryer. You should not have to contaminate your air system with foreign substances.
I drag my own platform but you D&H guys must all suffer the lowest denominator - the guy who's compressor is running 100% duty, his air dryer pops off every 20 seconds and he drains a gallon of water and oil out of his primary tank!
I own my truck 15 years and have yet to get one drop out of my primary.
And... check this
Wolverine Engine Heaters if you have 120V these are the cat's nuts! An engine oil pan immersion type heater, a pad heater for the batteries and your immersion type coolant heater and you should be ready to lease on with Carlisle! Make sure to call Kevin he'll hook ya up right.