My boat is an R23. I also have the West Marine RU-250…..this is the roll up model with a slat floor. On sale for $600 last year. I first tried a Saturn Kaboat….at 12 ‘ it was too long to stow on the roof…if it came in a 9’ length it would have been perfect. Also the tubes are not very large.
Next came a North Atlantic inflatable 9 footer. Great rugged boat but just too heavy…and once on the roof it sagged with cold weather, as do all, and had to be mounted upside down to keep the water out.
Finally gave up on roof mounting and went with the roll up which stows neatly in the center lazarette.
I have an old 3.5 HP Mercury 2 stroke from the classifieds that weighs in at about 30 pounds and can also go in the lazarette, or set on my rear corner hand rail, dedicated outboard mount. A small portable two gallon fuel tank goes in front anchor line locker. I also have a cheapo electric motor powered by a 50 amp hour battery…..great for small runs to and from shore. Just make sure the shaft length is long enough so that the top of the propeller can’t strike and slice open the underside of the dinghy when rotated in reverse, even if you have a reverse button.
Bottom line at age 72, I’m done wrestling alligators….so weight had to be under 50 pounds and reasonably carry two or three. I was never a fan of slat floors but it does reduce weight and they remain in place when rolled up….so there’s no messing around, just inflate and go. Rows fine too, though without a keel, slides around a bit. I am able to blow up and breakdown the dinghy while at anchor but is much easier drying it out and rolling it up on a dock.
In lieu of towing or stowing, for quick runs I also designed a dinghy carrier out of pvc and rod holders such that the dinghy straddles the main outboard motor upside down on the swim platform rails, aligned fore and aft. The bow rests on another PVC cross bar supported by PVC inserts in the two cup holders. The whole mess breaks down and can be easily stored…and costs less than $50….excluding rod holders.
Trial and error for me…..Good luck to all