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The weight of the Johnson 85 is about 300 lbs, the 90 Yamaha is about 370 lbs. The Yamaha is at the high end of what people want to hang off the back but the Johnson is no lightweight. I doubt the extra weight would make a substantial difference.

I guess I'd want to know how the boat floats before I added any weight to the back. Actually, I'd want to see how it floats before I bought it.

If the boat is fair to good $5000 is more than I'd pay for it. Then again prices for Whalers seem to be high right now, sometimes absurd.