Usually there isn't a controller because owners will want to do anything from a $$$$$ lithium system to run AC while boondocks to a $ system to trickle charge a battery. What they have done is run the wires for you.
You won't necessarily need a "kit". A 10 amp controller and 25 watt panel will handle what you are planning.
2017 JayFlight 21QB
2021 Ford F150 SCrew 3.5 Eco, 157”, 3.55, Tow Pkg