recently my friends and i rented a U Haul trailer and hauled his fj cruiser to the desert to really test it out
the way we got it was saying we were towing a smaller vehicle, u haul will not rent you a trailer to tow a car that heavy
if you do this and something goes wrong however, do not blame me haha
also there is only one type of double axeled u haul trailer, but there are two generations, if you do tow your 4runner use the older generation, the guy who worked there was telling me about this when i rented it