You said Kayak camping not car camping with the kayaks so I am going to say you mean kayaking then camping away from the car. In this case I agree with building your set up just like you would a backpack .... keep it light and small and have watertight bags for all the stuff. A 3 person backpack tent will work fine for the two of you (2 person is just too small) find one that you can sit all the way up inside also incase you get stuck on a rainy day. Go ahead and buy an extra set of light folding tent poles and bring a nice extra tarp to make a vestibule or small outside shelter also.
If car camping the TentCot is great ... I use mine more now that any of my other tent setups. If you will camp longer than a couple of days I like a base camp tent with inside cots better than the TentCot where you have room to move around .. change cloths etc. etc. .......... there are just so many different ways to camp
This is my 3 person EMS backpack tent that I use from the kayak .. It has become my roomy yak camping tent.