I am in the beginning stages of my 150 gallon reverse flow trailer build. I have used the BBQ Calculator http://www.feldoncentral.com/bbqcalculator.html to start my planning. But since I am building a reverse flow, what are the main differences I need to take into effect and what calculations need to be adjusted? Thanks for any and all input from everyone. I have gotten so many ideas from this forum reading through all the other build threads.