Under the class rules (25), the dinghy should weigh about 168kg.
As mentioned previously, what is the problem you are encountering when launching and recovering.
What type of trailer is in use, a Combi trailer or just a road trailer.
Concrete slipway, steep slope or sand, shingle or mud.
Is the dinghy loaded for cruising purposes with outboard etc?
On level ground, with the dinghy on the trailer, are you able to move the trailer around without any great difficulty?