RVA COMPANY

Why Use Three Jacks To Level And
Lift a Motor home?

One Point determines A POINT, Two points determine a LINE, Three points Determine a PLANE.

Four POINTS DETERMINE CONFUSION (such as a four legged table with one short leg)

A three point system can be compared to a CAMERA TRIPOD. THREE POINTS ARE THE FASTEST, SIMPLEST,  SAFEST METHOD OF LEVELING.

Axle capacity of the average entry level class "A" chassis is generally rated at about 6000 lbs front axle and 12000 lbs rear axle with one jack in front and two in the rear . -THE JACK SIZE REQUIREMENTS ARE APPROXIMATELY EQUAL (THREE POINTS).

A four point jack system using two jacks to level in the front and two to level in the rear could lead to undesirable loading and stress of the chassis.  Studies have indicated that both the coach and the chassis construction are not as rigid in the front as they are in the rear. THEREFORE USING THE REAR TO LEVEL A MOTOR HOME(WHICH IS INCORPORATED ONLY IN THREE POINTS) IS THE SAFEST FOR THE VEHICLE.

What Keeps The Vehicle From Tipping Over When You Mount The Entry Step?

Because the center of gravity (THE POINT THROUGH WHICH THE RESULTANT GRAVITATIONAL FORCES ON A BODY PASSES) or center of mass (THE POINT AT WHICH THE ENTIRE MASS OF A BODY MAY BE CONSIDERED CONCENTRATED) resides in the rear portion of the coach (VISUALIZE A TRAVEL TRAILER)- it is not possible to tip the motor home over by stepping upon the entry step,UNLESS YOUR BODY WEIGHT IS GREATER THAN THE TOTAL WEIGHT OF THE MOTOR HOME.