Close to peak
I do not know that trust specifically, but from my understanding the trust values are from the future cash flows of selling the oil reserves.
There are two factors for the investment risks at present, high oil price and tax law change. If your investment advices recommended it early last year, it would be a great idea. At today's oil prices, I assume the trust price already went up.
Personally I feel oil price could go to $100 and that would be time to invest in oil and energy.
Personal opinions for reference only.