Hi,
You might consider a tandem inflatable kayak. The person in front can fish, but the person paddling in back can't fish. If you had two inflatable kayak then you can strap them together and float four people down, but the person guiding the strapped kayaks should have some river guiding skills. I have paddled upstream on the american river without any issues by myself in a tandem inflatable kayak.

I have fished out of lakes in my inflatable kayak but it would be better to a have a motorized skiff. This is the dilema.

At least if you have an inflatable kayak it folds up and can be stored in the garage.

I have an Aire Caracal-tadem that I use occasionally because I have a six and eight year old that want to go fishing. Space is limited so I have a 10' portabote with 3.5hp on a harbor freight trailor.



Good luck
MarkZ