I just looked up three manufacturers of 5X10 enclosed trailers. The average empty weight was 980 lbs. Certainly there are both lighter and heavier available.If you can fit in a heavy duty transmission cooler with a fan that will greatly help. Install a switch so you turn it on or off when needed. Some fans are quite big so you need to ensure the fan and cooler has enough room to fit.
Those 5 x 10 trailers are close to 600 lbs so they are not as heavy as they look.
Should have gotten a V6 with the tow package since that would have worked out better.
I edited my post as you were writing yours just in case. I know some are heavier and some are lighter depending on the material. If the OP wanted to get a 5 x 10 trailer he should look for a lighter one to save on the weight capacity. It would make a big difference for him. I was planning on buying one last year for a big cross country move but that did not happen.I just looked up three manufacturers of 5X10 enclosed trailers. The average empty weight was 980 lbs. Certainly there are both lighter and heavier available.
What about towing without the brakes?
Toyota flatly states that brakes are required towing over 600 lbs. Unless the trailer you are considering towing has surge brakes ( or electric), you are just asking for it. Again, my opinion as a person that has towed for a few decades.What about towing without the brakes?
He says V4 which doesn't exist on a RAV so I'm assuming I4 2.4l engine.Maybe I missed something but from reading your profile and your sig. line I couldn't determine whether your RAV has the 4-cylinder or V6 engine. How much you can tow depends upon which engine you have. In any event, unless a RAV with 175,000 miles on the clock has been abused, hasn't been properly maintained or has had lots of problems it should be good for many more miles.