Does it have a motor? I would be just as concerned with that.
One thing you could do (it'd be a hassle) is take the boat & trailer to a weigh station & weigh them both. Take the boat to the lake (or somewhere) and take it off the trailer. Take the trailer back and weight it... subtract from the total to get the weight of the boat. Make sure it lines up with what is expected for that model so you know the foam isn't waterlogged or something.
Any reputable boat shop should be able to do a general inspection of the transom and let you know if it looks ok. I personally wouldn't buy a boat that old from someone I don't know & trust without having it checked out. Paying a shop $100-200 to check it out is worth saving yourself a lot of headaches down the road. If it checks out and you like it, they're good boats!
EDIT: one of my buddies had a 20XD from around the same time period. It was somewhere between 99-01. It was extremely well taken care of and had a new custom trailer built for it, but had motor issues. He sold it, and the new buyer wound up getting the motor fixed right and last I heard it had ran great. With a 225 it would run in the 70's.