Breakwave, the team that created and manage the Dry bulk ETF - BDRY, have come up with a new shipping ETF for the tanker side - BWET. The new ETF has a similar model to BDRY i.e. using index futures
World’s First Oil Tanker Shipping ETF | Business Wire
Personally, I think one can likely do better creating a basket of tanker names, and cycling them in & out of the basket over short or medium time-frames.