When trust document grants the beneficiary the power to remove and replace a corporate trustee “for any reason whatsoever” with court approval, the beneficiary did not need to allege or show any cause for removal provided by 20 Pa.C.S. § 7766, which is not among the mandatory provisions listed in § 7705(b), and so the provisions of the trust document control under § 7705(a). Trust under Agreement of Taylor, 640 Pa. 629 (2017) was distinquished. Partricia Sankey Special Needs Trust, 9 Fid.Rep.3d 49, No. 1896 of 2014 (Philadelphia O.C. 8/29/2018).