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Email features have been reactivated 4/17/24
Not sure why you'd move from pots to root builder. The outside tree's roots will just take over the RB pots.
There is a way to rid the GH of outside roots without taking out the trees. Trench around the GH about 3-4ft deep. Install heavy duty root barrier into the trench. That way your GH trees can root into the ground without competition.
Zills is wholesale only. you can buy mango fruit from them during the season though. Although they do pick them early as seen on numerous threads.
And just about everyone else does both.