Special needs trusts can be complicated. They can be expensive to create on your own and knowing how to administer them is very no easy task. Selecting a trustee is often the hardest thing to do because it takes significant knowledge and skill to handle the trust's investments and know when and how to distribute money for the beneficiary.
A pooled trust like the Berks Community Trust is an excellent alternative to a standalone special needs trust. A trust account can be set up for significantly less money than is needed for a standalone trust.