Yes, "lemons" are generally thought of as defective cars. But, the lemon law equally applies to all kinds of things, such as RVs, boats, motorcycles, TVs, etc. Whatever the item is, you only need to prove (1) there's a manufacturer warranty, and (2) you bought or leased it for your personal or family use. If you answered YES to both, it's probably a consumer good.
All types of vehicles and boats apply...
Even household products, appliances, electronics, musical instruments, etc. can be considered lemons.
Lastly, if the thing at issue is something that you used, in whole or in part, for business purposes, then that could certainly jeopardize your claim. I would need to discuss this with you more in depth to weigh in.