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Travis' idea is excellent. I would like to offer a similar pin. It's a quick release pin that doesn't use a spring clip on the back side that migh be difficult to access. Similar to a ratchet handle, you push on the center button and it releases the spring tension on the ball at the other end for easy removal. However, the hole size must have a close tollerance. Amazon has various sizes that might fit your application. They're just over $30 each. As for installing and removing the various attachments, you migh consider a design similar to a slide in camper found on the back of pickup trucks. But you might want to reconsider bolting the modules to the frame from the top side of the floor especially for the passenger seat module if it is to be used. Consider bolting seat belts to the frame (required) and not just to the module.

I'd Replace all air, and fuel lines, hoses, filters, plugs and wires too. Of course you'll check the function with each new hose, belt, whatever. Along with new gas, I'd add some fuel stabilizer. I use it year round, because its cheap enough. Specific radiator hoses are typically a bit pricey, so those can wait...for now. Your okay plowing the yard if a hose breaks. But if you ever take it on the trails, then I'd replace those hoses as soon as possible after this other issue gets solved. What you're likely dealing with, is a combination of things. Most, if not all, from the sound of it, are from lack of proper periodic maintenance. I'd do this first, since it needs to be done anyway. Besides, you might get lucky, and find the problem while you're doing this.

Well, in my quest to check all my grounds, I noticed a large, vacuum line (off carb), with split ends. I must have bumped it because I couldn't keep the UTV running. I realized it was carb/fuel related, so I grabbed some tape and temp fixed the hose ends. It's starting better than before. Gonna see how it is in the morning. I also see that it could use a new fuel filter. Not sure how long it was sitting before but I'm gonna look at all the vacuum/type hoses.