For payload... you want a Kadet Sr. That's the heavy lifter of ARF's able to carry double its own weight if you have a .61 in the nose.

Unfortunately... its cruise speed would be around 50 to 60 full loaded, and would go down as fuel burned.

Actually... you could get about the speed desired from any Cub. The models fly faster than you may think at low speed. (slower than you think at high speed)

For the heavy lifting of the fuel load... and to stay with the 1.20, you want an ARF that specifies .91 size 4-stroke in its upper to mid-range engine sizes. Then you want to use a medium to long prop, seeking the pull power rather tan the speed of a short high pitch prop.

Almost any appropriate size plane for the 1.20 will lift the load. They will carry a large amount if yo don't want to do any aerobatics, and you have adequate runway. Practice flying it with heavier loads by strapping on a soda bottle that can be dropped by servo controol (so you can always land with the aircraft at its lightest without having to fly for 2 hours to burn off fuel.)

Also... do some timing of fuel consumption with different loads. You may be suprized at the amount actually needed to complete the flight.

And... plan on unexpected headwinds making the flight take longer... good practice for point-point is to carry 20% more fuel than normal wind patterns say is needed.