This idea is not common but it has been done before with good results, Zap electric bicycle kits used two motors, solectra chevy S-10 pickup trucks used two motors side by side, another company that converted geo metro gliders I think used two motors end to end and the drag race car White Zombie used two motors that ended up being grafted together to share a single drive shaft after a bit of time passed.
I think using two motors is a great idea and there is more then one way to do it, it doesn't seem that common for the home conversion but it does open up alot of options and I look forward to learning more.
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