With regard to moving F-RIBS you have discovered what awkward packages they are when folded. For true portability you can't beat Gurnard's combination of the 275 and 6hp motor. He launches just about anywhere. My 330 is just too heavy/awkward for me to lift into the boot of my BMW 330 saloon on my own, though with two people and the seats folded I can get the folded 330 and a Yamaha 6HP in, though a 15HP won't fit. I use a LARS side loading roof rack (similar to Kari Tec but with gas struts) and the folded 330 goes on it much more easily than in the boot.
Can I make a left field suggestion? What about a trailer? I think for the weight and size of a 360 with a 15HP 2 stroke, a trailer makes a lot of sense. I even use a trailer to move kayaks if I have the family with me. Then all the wet gear goes in the kayak cockpits with a cockpit cover. If you buy a decent RIB trailing cover you can stash all the wet gear in the boat. Then the family don't get sick from breathing fumes from the outboard as a bonus
Having owned an F-RIB 330 for 15months and had it out over 100 times and seen how often and easily Gurnard gets away in his 275/6hp combo using his SUV, I think the folding makes most sense in the smaller sizes. If I was to buy a bigger RIB, sub 4m but bigger than 330, I probably would not buy an F-RIB but would go for a conventional non folding RIB and operate it off a trailer. Part of safe boating should be understanding the risks handling awkward and heavy weights poses to our bodies. Even with my medical knowledge I ignored this and ended up ripping two tendons off the bone in my shoulder (lifting a 35kg kayak in a wind). I required extensive surgery and long physiotherapy which was very painful. Not only did I cost the NHS/taxpayer £25k, I was off work for 3 months (that was a a lot of cancelled clinics) and off the water for 9 months. It is all too easy to say It won't happen to me, that is exactly what I used to say!
Lastly if you are going to be regularly launching and landing off soft beaches without a slipway for a trailer, nothing beats a trolley with balloon tyres.

I can pull my rig up a steep sandy beach on my own. Transom wheels are a complete non starter on this beach. The trolley collapses into small parts as it is all held together with captive pins. You could transport the collapsed trolley inside a van (I like Chis Moody's suggestion) or inside the F-RIB on a trailer (if you were not/unable to use the trailer to launch).
Anyway however you get to the water (do enjoy spending some more money
Douglas






