Weight Capacity 91 Lumina APV

I just bought a 91 lumina, 7 passenger van. Only 77k miles on it. I am now going to sell it and the prospective buyer wants to know how much weight it will carry? He is going to use it for his tile business. I assume that since it can hold 7 people that it would at least 1,000 lbs. But I can't find anything on a google search that would confirm that for me. Any help would be appreciated.
Thanks

I think its actually a bit better than that... But if thats what he is going to do he may want to invest in a set of cargo coils for the rear as well as a set od Air Shocks...

I have a 95 Transport with the Load Level, and even with the Air Leveling it was a struggle... I had 1200 Lbs in it...lol