There may be a problem caring a H16. Check the load limit for your roof rack. Most factory systems have a 100-200 lb limit. If you are using Yakima or Thule, call them. Going 50% over is normally not a problem. Going 100-300% may be a problem. You might be able to add a door mounted rack to a factory rack to distribute the load

Caring a catamaran on roof rack, can be done. I have done it for short distances. I have seen an A-class and mast carried on a roof rack from Key Largo to California and a Tornado with mast on a full sized Van with "ladder racks". I have also seen the roof of a Dodge minivan cave in when the owner tried to put 200-300 lb of 2x4's on it

Do your homework at home, not on the side of the road 3 hours from home.