If properly bottom painted you should only have to haul once a year for power wash, zincs and bottom touch up. Bottom paint should last 2 years. Micron CSC. You can changed leg oils annually or every 2 years. I do mine annually.
Maintenance on those Volvo 41's is easy. You can buy all filters online cheap. I do my own oil changes with a manual oil extractor I got from Princess Auto.
I think I even have a few spare parts, filters and Zincs for the 41's I can give you.
Would be happy to give you some advice once you take ownership. Plus once you get setup on the Commander page you can ask questions of the group.
https://www.princessauto.com/en/detail/9-1-2-litre-manual-fluid-extractor/A-p8319667e