Pulling a trailer with 1990 4Runner

We are just planning to buy a travel trailer it will be between 19' to 20' long. Some of my friends were laughing that Im planning to pull trailer with my 4runner. My truck is 3 Litre V6 and Im pretty confident that I can pull trailer easily with this truck. Now the questions from all the Gurus of 4Runner, if this is possible? I will really appreciate your reply.

What does the trailer weigh? On flatland or in mountains?

Make sure your cooling system is up to snuff. If it has been more than 50k miles or 2 years since your last cooling flush then it is time to change the coolant. The 3.0's are not the most durable of toyota engines. If they are run at higher than normal temps for a long period it can blow the head gasket and damage the engine. The 91-93 3.0 had a lot of problems with it so you might be ok, but its something to think about.

Make sure your cooling system is up to snuff. If it has been more than 50k miles or 2 years since your last cooling flush then it is time to change the coolant. The 3.0's are not the most durable of toyota engines. If they are run at higher than normal temps for a long period it can blow the head gasket and damage the engine. The 91-93 3.0 had a lot of problems with it so you might be ok, but its something to think about.Thanks alot for your answers now I know what to watch for...Thanks again