I have built & cruised three multihulls... Lived aboard for 15 years, and unfortunately spent half of that period working while in
marinas. (about a dozen different ones)
Our
current 34' tri is 21' wide, & we have found that both dockage & hauling are harder to arrange. Hauling IS more expensive, but for us, dockage is not. We use a "T head" or other side too
dock, where we take up no more dock space than a
monohull of the same length. Many marinas have an area that is too shallow for monohulls as well. You have to shop around. Mark