We've had a Yakima rack n roll 66 for nearly 2 years now and have put easily over 8,000 miles on it, carrying two kayaks, about 82 pounds total weight. The last trip from Florida to Alberta it didn't seem to us that it increased the fuel use that much. Coming back, we had a Dagger Agent 6 secured on the roof rack and we felt the wind resistance and we fueled more often. We were using the kayaks on the trailer every other day and the one on the roof was for our grand kids and wasn't being used during the trip. The trailer can carry up to 4 kayaks (and 2 kayaks and 2 bikes), but with the third you will be aware of pulling a trailer, not so when we are towing with only 2 kayaks. Our kayaks are 13 and 14 feet long. If we want to explore an area after paddling, we just unhitch the trailer at the camp site, secure it and drive without a load. It's so light, the trailer, loaded, can be pulled from one spot to another. The trailer has been folded up and stored when we were away once for 3 months -- takes little space. Costly, yes, but it has added tremendously to our enjoyment of kayaking. We kayak more frequently because it's so easy to load. You won't find any used ones for sale. I did, but after I mentioned to the seller that this would be our second (we were going to give it to our kids) and how great the trailer was, he decided, on second thought, not to sell it.