A: It depends.
There are restrictions on payments of Trust Corpus (assets) and Trust Income, both of which are defined in the Trust document created by the Grantor of the Trust. And know that there are three types of income that come into play with a Trusts, two of which (#1 & #2) will impact the answer to your question about distribution of Income (which can include Farm Profits) -
1) Fiduciary Income (being defined by the Trust Document or by the Uniform Principal and Income Act adopted by the state within which the Trust is domiciled.
2) Distributable Net Income (DNI) that is calculated differently and is the limit on how much of the distributions are allocable to Beneficiaries and thus are/aren't deductible in arriving at Taxable Income.
3) Taxable Income that is defined by the Tax Code. Trust Tax Rates are higher than individual rates, in most instances, possibly making a Trust a very poor tax planning vehicle, even if it accomplishes liability protection and control goals.
You mention it is a Spendthrift Trust. Those Trusts seldom holds business interests like a farm. It also usually has very tight restrictions on distributions, not merely "Trustee discretion."
You mention the Trustee has sole discretion as to distributions, but profits get allocated equally between the Trustee and the Beneficiary. I would get that checked out, as I know of no Trust that a Trustee is allowed distributions the same as a Beneficiary. One can be both a Trustee and a Beneficiary of the same Trust (not recommended), but they are different roles/standing, and each gets a different type of payment/distribution, with different tax consequences and deductibility.
As a side note, over half of my CPA work was Trust and Estates. Most CPAs were happy to bring their Trust returns to me. Those who tried to do it themselves, especially with Trusts drafted by attorneys who knew little about Trusts, usually were a train wreck, especially if it held an operating business.
From what you have written here, I see a lot of incongruities that might be problems you weren't anticipating. I would make sure you get working with someone who knows the answers to your questions. Once you start operating a business in a Trust, things get complicated, fast. Make sure you have a Trust attorney and Trust CPA who knows this stuff.
And also know that there are a ton of snakes out promoting Trusts as a necessity, as a tax avoidance entity, as the only way to avoid probate, and a ton of other stupid reasons that I've had clients be pitched Trusts as the answer to all of their problems. When the situation calls for it, Trusts are great instruments. But, the situation calls for it maybe 5% of the time.