You can’t tow safely unless you know the tongue weight of your RV.

• Too little tongue weight can cause uncontrollable trailer sway.
• Too much tongue weight can overload your tow vehicle hitch and rear axle.

As a rule:

• 10-15 percent (~12%) of the weight of a travel trailer should be on the tongue
• 15-25 percent (~20%) of the weight of a 5th wheel should be on the pin

Tongue weight isn’t a fixed number. How you load your trailer changes the tongue weight.