Even if you're on relatively good terms with the person to whom you're writing, Spanish letter writing uses more formal and polite language than you might use if you were writing the letter in English.  In Spanish, formal writing tends to be more passive than language you might be more accustomed to using in English. Speak conditionally (quería saber si ustedes estarían disponibles or "I wanted to know if you would be available") and use the formal "you" (usted or ustedes) unless you are on close personal terms with the person. If you're unsure how formal your letter should be, err on the side of formality. You are less likely to offend someone by being overly polite and formal than by being too casual or overly familiar. If you've met the person several times before, or if you're responding to a letter they've written you, use those previous exchanges to guide your formality. You should never be less formal than the other person was to you. Even if you're writing an email, colloquialisms or slang and abbreviations used in texting or casual conversation on the internet are not appropriate to use when you are writing a letter in Spanish. For the body of your letter, state your points or information in decreasing order of importance. Aim to write in a clear, concise way so that your letter ends up being no more than a page long.  A personal letter, such as a letter to a friend describing your experiences on vacation, can be as long as you like. But for a business or other formal letter, be respectful of the receiver's time. Avoid going off on tangents that are unrelated to the purpose of the letter. You will impress the person more with your ability to write a formal letter correctly. It may help to outline your letter briefly before you start writing, so that you know exactly what points or statements you want to make, and how you want to make them. Having your organization down ahead of time makes writing easier, especially if you're not writing in your first language. Your letter should be single-spaced, with a double-space between each paragraph. A paragraph doesn't need to be more than two or three sentences long.  For each separate idea or point in your letter, you should have a separate paragraph. For example, suppose you're writing a Spanish letter to apply for an internship. You have two basic points that you want to get across: your experience, and why you would be the best applicant for the internship. Your letter will include an introductory paragraph, a paragraph about your experience, a paragraph about why you're the best applicant, and a closing paragraph.
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One-sentence summary -- Keep your language formal. Start with your most important point. Break the information into paragraphs.

Article: A utility trailer should be customized to your specifications. You will need to decide on the length, the weight capacity, and whether or not it will be enclosed. For example:  If the utility trailer will be used for lumber or building materials, it may need stronger suspension and larger wheels. For ease of loading and unloading—especially lumber—you would probably not want it enclosed. You would also want to make it long enough to hold lumber and sheeting. For machinery and valuable tools, you would not only want it sturdy, but also enclosed and secure to prevent theft. The vehicle that you will use to pull the utility trailer will also help determine the dimensions. For example, a utility trailer to haul groceries behind a bicycle will necessarily be much smaller than a utility trailer for a Suburban, built to haul a table saw. You may choose to build a utility trailer from scratch or assemble a kit. Either way, the right tools and materials are essential. Search online websites for utility trailer kit plans or visit a home improvement store, or tractor supply dealer for ideas. In the planning stages, it's important to be aware of your construction and mechanical expertise and capabilities. Building a utility trailer from scratch will require welding skills, an aptitude for carpentry, and electrical knowledge to install taillights. It also helps if you're comfortable with heavy lifting.
Question: What is a summary of what this article is about?
Determine the type of trailer you'll need. Decide the method of construction. Confirm your level of ability.