Trailer hitch - receiver question

I noticed that my trailer was riding a little low in the front so I decided to go from a 2" rise to a 3 1/4" rise receiver. The old receiver was rated at 6,000 lbs but the new one is only rated at 5,000 lbs. I'm pretty sure that my boat and trailer combo weigh more than 5,000 lbs. Is there another company besides Reese that makes a heavier duty receiver??? I wasn't planning on spending $200 for one of those adjustable ones.

Boat is a Tige RZ2 (3,900+ lbs) and the trailer is an EZ Loader Illusion trailer (weight unknown).