There is a simple way to see if your catamaran is sufficient for cruising. There is a weight limit placard on it. We have several catamarans from 32' to 41' and all have a maximum load capacity placed on them. The newest being a '09 Lagoon 40. Usually the larger boats are rated for a maximum of 8 people and so many pounds of gear. This includes
fuel, water and food. Catamarans aren't considered a displacement vessel so they have limits. Another thing to consider is they don't have ballast and your mono hull may have 1/3 it's weight in ballast My boat weighs 26,000 lbs with 9,500 lbs in ballast). So the biggest worry is overloading. Hope this helps.