I used to have a 5.85m Zodiac inflatable, which I decided to get a full bed trailer for.
I did look at the deflate and stack option but the costs were coming out rather close and as I was often working solo or as good as so went the other way.
The military have a space frame / cage made up that you can put the engine into to make it easier to move and strap down to a trailer.
After running with a hand stear 50 for a while your arm and shoulder will be rather sore even if you have the shoulders of a Bear! and bearhugging a 50 hp outboard on and off a transom can be hernia inducing and if you haven't had one may I suggest you keep it that way they are not fun
Hope it helps drop me a pm if you want more info.