Wis. Stat. § 856.23
A nominee may not be found "unsuitable" except upon grounds pertaining to capacity or competence to administer the estate. State ex rel. First National Bank &Trust v. Skow, 91 Wis. 2d 773, 284 N.W.2d 74 (1979). If a trust document allows the beneficiaries to select a successor trustee but does not specifically allow appointment without court approval, the instrument should be read to permit nomination of a trustee subject to court approval. Matter of Sherman B. Smith Family Trust, 167 Wis. 2d 196, 482 N.W.2d 118 (Ct. App. 1992). A finding of unsuitability is not limited solely to concerns of incapacity or incompetency. Given the myriad circumstances in which conflicts of interests may arise a conflicting personal interest may prevent an executor or administrator from doing his or her duty and render him or unsuitable. But disputes over what assets are included in the estate do not render a person unsuitable. Section 859.09 provides the framework for addressing such disagreements. Klauser v. Schmitz, 2003 WI App 157, 265 Wis. 2d 860, 667 N.W.2d 862, 02-3260. A resident agent appointed under this section is not an indispensable party in an action involving the estate. Bugbee v. Donahue, 483 F. Supp. 1328 (1980).