I lost a lot of business last season because I could only accomodate two other kayakers. I could only put three kayaks on top of my vehicle. And I was hesitant to make long trips down the Interstate with three kayaks on top.
So, I bought a kayak trailer that holds four. Got it for $775. It's easy to load and the kayaks are really easy to tie down. I now have more peace of mind when transporting the kayaks. Additionally, I can now take groups of three.