3rdgen, I think it depends on what the trust document says. But one of the purposes of setting up a trust is to place the funds outside the beneficiaries' control. Among other things, assets held in a trust can't be attached to pay for a lawsuit if the beneficiary has no control over the assets. For example, if your parents leave you their house in an irrevocable trust beyond your control, and you run over somebody with your car, that person can't take your house in a lawsuit.
I'm sure the Watchtower's legal loves to help people set up trusts with the Watchtower as beneficiary, it would shelter those funds from lawsuits and let the WTBS collect the income. But it has to be done with somebody else's money, and the WTBS can't control what's done with it.