I've taken a shit load of DOT tests. You maybe OK. Pickup some metamucil and continue exercising till a couple days before the UA. Don't bother to drink tons of fluids just keep yourself hydrated to counter the exercising.Test yourself a day before the UA with a cheap thc test strip to see if you're good. I would still pickup some QF in case you're not clean. And be sure to practice keeping the heat right.
If you continue to toke after the pre-employement UA you're going to need some QF anway for randoms.
New to trucking?