Not less than 280 pounds. Rule of thumb is 10% of the total trailer weight on the tongue. Less is bad. More, within reason, is no big deal up to the limit of the weight the hitch can accept.
Your typical 5000-pound trailer rated hitch will also have a 500 pound tongue weight rating--10%.
For example:
www.amazon.com/Curt-13704-Adjustable-Trailer-Receiver/dp/B07GC26CBC/ref=sr_1_1?crid=2IQ27M8BHM3KS&keywords=5000+pound+receiver+hitch&qid=1684550580&sprefix=5000%2520pound%2520receiver%2520hitch%2Caps%2C169&sr=8-1&ufe=app_do%3Aamzn1.fos.c3015c4a-46bb-44b9-81a4-dc28e6d374b3
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