Expanding a business too fast can be a common challenge for entrepreneurs, but it's important to remember that mistakes are a part of the learning process. Here are some words of wisdom for your situation:

1. Assess your current and future needs: Evaluate your business operations and determine if the fourth truck is truly necessary for your day-to-day operations. Consider factors such as demand, growth projections, and the potential need for backup equipment. If it is not essential, selling it might be a viable option.

2. Calculate the financial impact: Determine the financial implications of selling the truck versus keeping it. Consider the cost of maintaining and storing the truck, the interest payments on the debt, and the potential resale value. Compare these costs with the benefits of having the truck as a backup or potential future use.

3. Analyze opportunity costs: Consider the opportunity cost of keeping the truck. By holding onto it, you may be missing out on other potential investments or opportunities that could generate higher returns. Evaluate if the money obtained from selling the truck could be better utilized elsewhere in your business.

4. Explore alternative uses: If selling the truck feels like a waste, think creatively about other potential uses for it. Can it be leased or rented out to generate additional income? Are there other industries or businesses that could benefit from its use? Exploring alternative uses might help you maximize the value of the asset.

5. Seek expert advice: Consult with a financial advisor or a business mentor who can provide objective guidance based on your specific circumstances. They can help you analyze the financial aspects, consider potential risks and benefits, and provide a fresh perspective on the situation.

Remember, the decision to sell or keep the truck ultimately depends on your business needs, financial situation, and long-term goals. Take the time to carefully evaluate your options and make a decision that aligns with your overall business strategy.