I have an 11' camper which means I need a 48" extension. I pull my boat on a tandem trailer, the total weight is around 4,500 pounds. Sometimes I pull my 14' cargo trailer which is probably around 5,000 pounds.
I started out with a Reese 48" extension in the factory Chevy 2.5" receiver. It worked fine. I didn't have any problems. I changed trucks to one that didn't have a 2.5" receiver. Instead of upgrading the receiver to a 2.5" I upgraded to a Superhitch. I know have the Superhitch 48" extension. It is a lot sturdier than the Reese. The turnbuckles take out what little slop there is. It's rated for 12,000 pounds with WD at that length and I don't doubt them for a minute.
If your trailers are small and you have a 2.5" receiver then the Reese may be fine. I know you'll have no problems with a Superhitch.