Dodge 1500b van

Is it a 727? We don't know the year of the van. I though a 727 was a 3 speed. I would think most vans that are still on the road would have a 4 speed?

Don't let them scare you off with transmission talk. 727 automatic is as good a transmission as they come. I would be more worried about the floor in a B series van of that vintage.

It will be as good as any 20 year old vehicle theoretically.
Whether it is good to you or not is solely dependent on miles, condition, maint and repair records, how often it’s been driven, what it was used for, how it was stored and where it was driven (rust).
Presuming you don’t know much about vehicles or you wouldn’t be asking.
The absolute best thing to do is take some one with you who can determine and understand the things I listed above.
Then realize that regardless of what the asking price is, it’s only worth a couple grand.
Then know that no matter how nice it is, it’s old and be prepared to spend as much or more than the purchase price in repairs and maintenance.
This is the big one.
Presuming whatever you look at is in good shape, you should be looking for the one that has a page long list of parts replaced reasonably recently. One that’s “never needed anything” and runs great WILL need the list of parts soon based solely on age at the best case and all the other stuff as well.

A more than 20 year old van as a tow vehicle isn’t a wise buy. What’s the payload and gross trailer weight max numbers?

I assume this is around a 90's vintage maybe? Those automatic transmissions were not the best. Dodge has never been known for good automatics.