As a full time RV'er there is little you can do to change the mileage you get when towing your rig. Also, keep in mind that the back-end of the trailer will swing wider than the tow vehicle path, so allow space for this. This way they can steer clear of the vehicle in case the cargo unloads and causes an accident. Finally, driving skills and safety tactics will help you on the road in the event your car hits icy spots or slippery snow covered roadways.
The bigger the van size the more the weight on the tow ball so the type of hitch needed depends on the size of your van. Most of the time redistributing weight in the trailer will solve sway issues especially if a weight distribution system with sway control is used.
They should help make towing your travel trailer a little easier. Towing a heavy RV can more increase your stopping distance by 50 percent or more. If you tow a camper, horse trailer, hobby trailer loaded up with dirtbikes or ORVs, or really cheap towing any type of trailer that bears a heavy load, you already know that getting great mpg is a pipe dream.
By changing the angle of the ball mount (see instructions) you can change the amount of pressure applied to the spring bars and the amount of weight distributed to the vehicle and trailer axles. You can prevent trailer sway by driving slowly and installing a brake controller, a weight-distribution hitch, and a traction control system.
When on the road, keep a much larger gap between you and the person in front of you on the road than you normally would, and start to gently apply your brakes well before stop signs and traffic lights. Regular maintenance is essential for safe driving and towing.
These involve additional loads in the vehicle that cause the vehicle height to reduce before the van is hitched on. If there is a constant additional load as, for example, in the case of an after-market LP gas conversion, then stronger springs may be needed to bring the vehicle back to its normal unladen height.
To make your towing experience a good one, you really want SUV or a truck with a proper towing setup. There are certain aspects of your driving that will need to change when towing a caravan, these include: judgement, control, speed, positioning and road awareness.