I don’t see an issue having the rents being divided up more and more as heirs multiply. Just one example, there’s a trust that owns about 10 million of property on my street in OB after the owners died 60+ years ago.
I have a hunch the property manager is overcharging the trust, but ultimately a lot of money and appreciation is going to the heirs, and probably at some point they’ll all vote to sell.
As far as choosing a trustee, you just pick an established estate attorney who will pass the work down to another one when he retires. There’s no need for a trustee to be a beneficiary with possible future conflicts with other beneficiaries.