Originally Posted by
slowandsteady
I did this recently. I got a MTB deore RD with an 11-36 Cassette. Inexpensive compared to a triple conversion and it is plenty low enough for hills even while towing my two kids in a trailer behind me(extra 70 lbs).
Unfortunately the OP has SRAM road shifters so he's going to have to replace the derailler, cassette, and chain, so it's not going to be an inexpensive option.