Anytime
Watch out for those fat chicks though. Tacomas can only handle so much when they're stock. You'll need OME 886 coils to keep the front suspension from hitting the bump stops when she plops into your truck.
I suggest getting a lift to discourage them from getting any exercise and entering your Taco. You'll need this lift to prevent damage to your diffs when she inevitably lowers your truck. Save up for alignments.
High load capacity wheels are a must. You will definitely need all terrains at the very least to get out of loading zones. Some Tacos have a driver side lean... This will be corrected with the addition of a fat chick (1 maximum) Hey look, a positive!!