Trailer hitch for 65 Valiant Wagon 106in wheelbase

My welds have been there for 15 years now so I guess they are good but I'm wondering how they would hold up under the stress of pulling a bike trailer with 1000 lbs on it . I'm just looking at options at this point so if someone wants to buy this sell it .
There may be 1000 lbs on the trailer but rolling weight is different. There is probably less than 400 lbs rolling weight. That's why you can move it by hand if it balances or push your car if needed.