Too much tongue weight could overload the rear tires of the towing vehicle, pushing the rear end of the vehicle around. When this happens, the vehicle is difficult to control; corners or curves may become more difficult to maneuver and your vehicle may not be as responsive when you try to brake.
A too-high hitch is very dangerous. When the hitch height is higher than the trailer, the trailer will tip backwards, unbalanced and wobbly. This poor weight distribution will result in a hazardous driving situation for you and others on the road.
So in short, level is best. If level is not possible, then try to go slightly nose down. Slightly nose up can be fine, but keep an eye out for trailer sway. You can view some additional information on towing a trailer at the links provided.
The height of the hitch significantly affects the tongue weight. Having your hitch too high will transfer too much weight to the trailer's axles. On the other hand, having it too low will put more weight on the tow vehicle. An ideal towing setup would have the trailer and tow vehicle sitting level.
To reduce the tongue weight of a trailer, move part of the load to the rear of the trailer. (Most experts advise that 60% of the trailer's weight should be over or in front of the trailer's axle). Assuming your trailer can meet that requirement, adjust some of the heavier items to the rear.
On average, you can expect a trailer hitch height of about 16-19 inches from the ground to the bottom of the coupler.
As a general rule, the use of extenders (and hitch adapters) can reduce the tongue weight capacity / vertical load capacity of your vehicle's receiver hitch. Extenders under 12” long reduce load capacity by 25%, and extenders over 12” reduce load capacity by 50%.
Too much tongue weight could overload the rear tires of the towing vehicle, pushing the rear end of the vehicle around. When this happens, the vehicle is difficult to control; corners or curves may become more difficult to maneuver and your vehicle may not be as responsive when you try to brake.
Load-distributing hitches are designed to distribute the hitch weight relatively evenly to all axles of the tow vehicle and trailer. The tow vehicle and trailer should be in a level position (altitude) in order for the hitch to do its job properly.
Your tow ball height should be such that the trailer sits level when fitted to the tow vehicle. As a guide the centre of the tow ball should be between 400mm and 450mm from the road surface when measured on level ground with the trailer on the vehicle. THIS IS OFTEN GIVEN LITTLE ATTENTION YET IS A SIGNIFCANT FACTOR.
Subtract the axle weight from the total trailer weight to determine your trailer's hitch weight. A general rule of thumb is that 20 to 25% of the total weight of a trailer plus its cargo should be placed on the tongue of the trailer.
The trailer is at the right height when: A Trailer will be lifted slightly when the tractor backs under it.
By moving some of the trailer's cargo rearward or forward the tongue weight will either increase or decrease. Weight distribution allows you to either move weight rearwards to place more weight on the trailer's axle, or forward to place more weight on the front of the trailer's axle.
We normally recommend at least 11” of clearance from the bottom of your LOADED trailer hitch ball mount to the ground, no less. That 11” of clearance gives you some leeway for bumps, dips, and slanted driveways so that you do not scrape the bottom of your hitch.
If your hitch is too low, it's going to put a lot of strain on the back of your car. The back bumper could be bent and damaged by this weight and pressure, plus the weight will not be evenly distributed throughout your tow vehicle.
Improper tire pressure, oversized trailer tires, stiff suspension, improper load balance or tongue length combined with the position of the axle can all be culprits. All parts of the towing system must be working together to keep the tires on the pavement and ensure a smooth ride.
By having a level RV you are ensuring your doors and cupboards open/close properly, the water in your pipes is flowing accurately and not pooling where it shouldn't, and your frame is properly supporting the weight of your rig. You can be adding unnecessary stress to your frame if your RV isn't level.
An oversized tongue that's always sticking out may be the most obvious and common macroglossia symptom. Other symptoms are: Noisy, high-pitched breathing (stridor). Snoring or low-pitched breathing (stertor).
The tongue is one of the strongest muscles in the body. It's rare for it to become strained because it's accustomed to nearly constant use from eating, talking and drinking, but it is possible. A strained tongue would be most likely to occur from overexertion or overuse of the muscle.
The most common causes for trailer sway are improper weight distribution, tight turns, steep roads, high-speed driving, a tall truck passing, crosswinds, over-steering, and under-inflated tires.
For trailering purposes, tongue weight (the downward weight the trailer exerts on the hitch) counts against the payload. You're not likely to see GVWR listed on a website, but curb weight and payload are easy to find, particularly for trucks.
Expert Reply: The length of the ball mount used in a trailer hitch does not affect the amount of tongue weight (TW) applied to the hitch ball by the trailer, but it does affect the amount of stress applied to the hitch's receiver tube by the ball mount.