Based on your description is sounds like you have too much (or not enough) tongue weight on the tongue of your trailer. My first question would be - does the boat have a motor? If not that would explain why so much weight is on the tongue of your trailer. Just add a motor and the weight of the motor on the rear will lighten your tongue weight. You want to distribute the weight somewhat evenly over your trailer axles.
If it does have a motor, I would say the boat is either positioned too far forward or too far back on the trailer. Some adjustment may be required.
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1994 Wellcraft V21
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