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Presumably you want to build a small robotic carriage.
2 motors of the same type on one 'box isnt going to gain a lot compared to one larger motor, even if you had 2 diffo motors with diffo rev ranges you'd have to mechanically disconnect one to run the other adding complex mechanisms.
The major benefit of having 2 motors and 'boxes, one per wheel is that you can have differential steering, running the motors in diffo directions to make your machine turn on the spot, also you dont need an additional servo motor for steering.
I assume their combined torque would be similar to that of the single larger motor.
This is starting to get out of my field, however what you say makes sense.
2.5hp on a vehicle carrying a single person would be decidedly energetic depending on the gear ratios.
Wheelchair or electric scooter type motors have the advantage of being cheap being quite common and are probably made to last a long time.
I built a new gearbox out of the two Toughbox's I scavenged. I removed one stage from each gearbox, so that the inpututput ratio was 14:50, rather than (14:50)^2. I chopped up the gearboxes and aluminum-zinc brazed the pieces back together, to get a 3 motor 1 stage gearbox:
Why not connect them one behind the other, isnt that the same as side by side.
The scooter clutch centre looks very much like a modded bicycle freewheel.
You might be able to arrange something with the small sprocket, the freewheel however would be bigger than the sprocket, you can get clickless needle roller type one way clutches which take a fair amount of torque for the size, but if you talking 2.5hp then you'll still need something chunky.
Maybe if you really want a clutch you could take the drive away from the motor, through a clutch assy and then back.