Most RV owners understand that tongue weight matters for safe towing, but what catches many off guard is how dramatically that weight changes based on where you load cargo inside the trailer. Adding weight behind the axles increases tongue weight, while adding weight in front of the axles decreases it — and the effect is amplified by leverage, meaning small changes in load placement can create surprisingly large changes in hitch weight.
This becomes critical when you consider where most people instinctively load heavy items. Water tanks are typically located behind the axles, so filling your fresh water tank can add significant tongue weight beyond just the weight of the water itself. Similarly, loading heavy items in rear storage compartments or placing dense cargo toward the back of the RV shifts more weight forward onto your tow vehicle than you might expect.
The reverse is also true and can be dangerous. Loading too much weight in the front storage compartments or keeping water tanks empty while carrying heavy gear toward the front can reduce tongue weight below safe levels, leading to trailer sway. The rule of thumb is to maintain tongue weight between 10-15% of the trailer’s total loaded weight, but achieving this requires thinking about cargo placement, not just total weight.
Many experienced towers keep a bathroom scale handy to check tongue weight after loading for trips, especially when they’ve changed their normal packing routine. Some also use the truck’s front and rear axle weights as a cross-check — if the truck’s front axle is carrying significantly less weight when hooked up than when unhitched, tongue weight may be too low for safe towing.