Paul welcome aboard
Maxum made the boat structure and then used products from different manufactures just like all boat builders. You should be able to search for manuals on line for things like the toilet, A/C, gen, ....
If you post a spefic part and manufacture here I am sure folks will provide what they can.
1997 Silverton 362, 7.4 Crusaders
1997 2400 SCR, 5.7 Vortec / Bravo 2