Write an article based on this summary:

Bring your forms and proof of identification with you to the DMV. Pay the registration and title fees. Check your state's regulations to see if you need insurance after registering. Renew your registration before it expires.
When you go to the DMV to register your trailer, make sure you have all of the required forms with you. Keep them in a folder so they stay organized and so you don't misplace them. Be sure you have some form of identification, such as a driver's license or passport, so the DMV can confirm your identity. Check online to see the forms you need in your area since they may have different requirements. After the DMV officials go through your forms, they will ask for payment for registration and titling fees. Make the full payment with cash, check, or a debit card to finalize your registration. Most times, trailers cost around $50-100 USD to register. Most DMV offices don't accept credit cards. The cost of registration may be more expensive if your trailer is heavier than 3,000 pounds (1,400kg). After your trailer is registered, look online for the regulations in your area to see if you need to get additional insurance for it. If insurance is required, reach out to your insurance provider to see what policies are available and work best for your trailer. Make sure you meet any minimum insurance requirements if your state has them. You may be able to add the trailer onto your existing auto insurance if you plan on using your vehicle to tow the trailer. Trailer registration usually lasts 1-2 years depending on where you live. When your registration is about to expire, fill out a renewal form and take it to your DMV office. Always keep your trailer registered or else it will be illegal to tow on public roads. Check the DMV website to see if you can renew your registration online.