Ugh. I'm fairly new to drums, but I've been working as a singer/guitarist/bandleader for many years.
#1: If you don't trust your bandleader, GTFO right away. What I'm saying is, if you can't rely on your bandleader to recompense you properly, they don't deserve you. They should be absolutely trustworthy and honest and forthcoming about what's happening with the money.
#2: Given that I've always enjoyed the trust and respect of my fellow players, I've never had an issue with this, so far as I'm aware. But, here's the deal I give my players: We all get paid equally, minus expenses, which includes a cut for promotion (gasoline, posters, and ads where applicable), and minus drink tabs, which...honestly...that's almost always $0.00, given the way I operate. And, minus tips to the bartender or security. I always make it a point to tip the people who work at the venue, but I also make it a point to explain that in full to my players.
#3: None of my players expect me to pay them in full on the night of the gig, because they trust me. The drummer needs $20.00 to fill his tank? Fine. We'll settle up the rest later.
#4: I'm saying this as a singer, and I think it's important, and I think that singers who don't follow this rule aren't right in the head. I am 100% involved in the load-in. Drums first, then PA, then keys, then bass and guitar. It's a group effort. Once that's done, my job is to schmooze with the crowd, and that continues for the rest of the night. So, I suppose, that's an extra burden for other players at the end of the gig, but that's precisely when I'm working out the money and making sure that everyone is happy, which is also part of my role in the whole process.
TLDR: You don't trust that you're getting compensated properly, get out now.