Richard,
You could do lots of things and spend lots of money.
But, I like ‘simple’ and ‘versatile’ for things like this.
A 14’ aluminum jonboat would suit your needs with no or at least just a very little ‘fiddling’. You want at least this long so you can put two fly casters in it and fish without too many tangles.
I’d ‘add’ mounts for two ‘pedestal’ or bass boat type seats. These mounts (flat plates with a hole in them) would be permanent on the boat, but allow the seats to be removable when traveling with the boat on the truck. You stated that you are both retired…seats like this will save your backs and knees from the strains associated with sitting for long periods on thwart type seats. They swivel, so you can face the direction you are fishing/casting…very helpful. As a ‘tip’- mount them as far apart bow to stern as you can and still have leg room as you turn on the seat.
A suitable electric motor and battery, and you are set. If you can afford it, a small (7-15 hp) 4 stroke gas engine will let you travel farther/faster if you want to.
I know you can buy the hull, brand new, from Sportsman’s Warehouse for around $800…other outlets should have a similar hull for around the same price.
For mounting the boat, two crosswise tubular braces is all you need…there are fancy roller and pully systems out there…but these boats are light and you can slide it up into place by yourself. A couple of racheting tie down straps and you are secure.
The addition of couple of those neat little dolly wheels to the transom will make moving the boat from the truck to the water and back easier. You can buy these that are permanent, that detach, or that fold…all of them work just fine.
You can find all of these accessories in the boating sections of catalogs like Cabela’s and Bass Pro Shops. Both places also sell the hulls, if you can get to one of them.
Aluminun boats are tough. If you do knock a hole in one, they are easy to repair with what you can find in the adhesive section of a hardware store.
They are light.
They will give you enough room for two people to fish comfortably and still be on speaking terms after a day on the water. You can carry all you’ll need, including a cooler with food/drinks and the dog if it likes to come along.
Aluminun jon boats are NOT rough water boats, though. If you think you will be on larger bodies of water or where wind/weather could be a problem, you might consider a 12 to 14 foot V hull…they will be heavier but handle waves better.
Buddy