Hi Wolter,
First of all let me say Welcome to RTMM and thanks for all the moderator work and everything else you do at ORBX....without ORBX, RTMM wouldn't have a platform for our scenery addtions.
Spud, is correct....you need Tongass Fjords FSX from FSAddon. The reason is that the AI Shipping packages use Tongass ship .mdl files. This is with the permission of Francois Dumas from FSAddon.
The installer should have given you a list of missing .mdls when it tried to copy them from your "assumed" Tongass Fjords FSX installation to the SAKAISP folders. Without the .mdls, FSX could easily fail when at activates AI traffic sometime past the 92% complete mark.
FSAddon does provide a discount to RTMM users......or check with Holger and maybe he can arrange something for you.
You just have to have Toongass to complete the wonderful scenery in this part of North America......I just love flying from southern PNW all the way to Anchorage making stops along the way (a long multi-day trip) and enjoying the best FSX scenery the world has to offer.
Rod