I believe Jackie and Phil Corwin have a set up like that with their travel trailer. Check with them if they had to re-enforce anything to put their 944 in there. As Paul said, check your weighs because the more space you have, the more "stuff" you will want to bring like a spare set of wheels, tool boxes, floor jacks, jack stands, fuel, chairs, bikes, coolers, umbrellas, EZ-Ups, compressors, generators, etc. etc. etc. it goes on and on and on
... did I mention a table, spare set of brake pads, maybe an extra set of front rotors, motor oil, brake fluid, window cleaner, helmet, driving suit (if applicable), gloves shoes, tarps, shop towels, jackets, 2nd set of clothing for hot or cold climates, food, plenty of water, etc. etc. etc.
...pretty soon, we're talking about real weight