Very hard to say. 17 thought 18 would lose to Vegeta, Trunks, Piccolo and the humans. This fight is basically subbing 18 for a slightly stronger Piccolo, and switching Piccolo with a much stronger SSJ Goku. The team should be able to win unless their coordination is off. Piccolo is an intelligent fighter, so if he can one shot Trunks from the get-go that would greatly help his odds.
I'll say the team wins this 7/10 times.