There is an option for solaris that can be set in the cfg file directly (raw configure or editor) called extended_cmdline in the setup section. It is a yes/no key. This will trigger an extra ps command which handles longer commandlines, and merges the data from the original ps command which truncated the commandline.
extended_cmdline = yes
This is also documented in the probe's readme file.
Release: CNMSPP99000-7.6-Unified Infrastructure Mgmt-Server Pack-- On Prem