Wow, we've stayed at Den Laman and used BDA for the past 2 summers (2 weeks each trip) and we've literally NEVER had a problem with putting 6 tanks in our truck and haven't ever had Andre or anyone else say anything. If they did, I'd simply explain we're heading south for 3 dives and don't want to come back to swap tanks in the middle. We always have 6 tanks in our truck to swap out, so we were doing that daily for 2 full weeks without being questioned.
To be able to get out early (7-7:30am), we simply take our gear up to our room after dinner and let our BCs and wetsuits dry on the lanai overnight. Simple to pack everything up in the morning and get out to the sites before most everyone else.
Maybe it has something to do with the time of year everyone is going though. We go in July when it's low season, and there are literally hundreds of full tanks between the tank room and the dock.