I have a suggestion for more configurations for the ibishu pigeon. (maybe a v8 engine one just kidding that would be too fast) because there should be more then just one 3 wheeled truck. Maybe something like the roamer for a pigeon. They did take the d15 and did that and it is a truck like the d15 so maybe. And i don't have many more ideas so any ideas. If this is bumped I understand. Oh and I may add some more of my ideas.
Pigeon-4-Wheel-Edition-V2-Now-with-custom-engine-sounds I know its not exactly what you were thinking of, but its the closest thing we have at the moment
Something I tried last week. I tried getting the mail pigeon 4 wheels and taking the back and putting it on the 3 wheeled pigeon to make it look like a reliant robin. It failed.
You should add something like training wheels(to make it more stable) to the pigeon as a part, and a second version the has the wheels as default and has a v8(and maybe a race suspension)
The pigeon already has stabilizers, like the one from top gear. You just need to select them as parts in the vehicle editor