Regarding tankers, the ONLY risk that I can't seem to put my hands around is the obvious one associated with an environmental disaster. Specifically, what would happen if one of NATs tankers ever did the Valdez Twostep?
One the one hand, I would expect tanker owners to have maritime insurance. On the other hand, is it enough insurance? On the third hand, well, you get the picture.
From a financial perspective, all risks that I can identify seem reasonable, and I have discussed these on this forum previously. Certainly to consider their 10%+ dividend yields, supporting a 6% maximum retirement withdrawal rate, less risky then an equivalent investment in another stock yielding a percent or two!
I, personally, owned both NAT and VLCCF for almost 5 years, before selling out earlier this year. I also owned Arlington Tankers for a brief period of time. What I did was consolidate all of my tanker money into Frontline. The reasons were simple.
VLCCF was always strictly an owner of their fleet. They had little to do with operations. NAT used to be an owner/operator, but they, too, are getting out of the ops business and are concentrating on ownership.
FRO, OTOH, is de-emphasizing ownership and concentrating on tanker scheduling and ops. They sold/spun off their fleet, and leased back individual ships on long term charter rates. They then run those same ships on the spot market, taking on spot market risks, while expecting spot market returns.
The reason this strategy works is that FRO is the premier tanker scheduling and fleet operations outfit in the world. Likewise, last year, whenever spot rates were down, FRO converted some of their ships to non-tanker uses, helping to match tanker supply and demands forces.
The bottom line is that the tanker market has been, and will continue to, consolidate, and FRO will end up at the high end of the food chain.
I also like the tanker market's tie to oil prices!