When there are places to tie the ropes to, or to hook the bungee cords to , then it is easy to tie loads to car roofs with ropes or bungee cords
The places to tie the ropes, or hook the bungee cords , are w called anchor points.
Here is how to make these temporary anchor points
The use of a ratchet strap is also most highly recommended.
The use of a rubbery roof pad is also highly recomended
Step 1: Materials
The materials have to be strong and thin.
For my vehicle, I would consider strong as having a working load of 75 pounds or more
I would consider thin to be less than 3/8 inches thick.
Although I will illustrate the procedure with nylon military belts ( straps)
Other materials could have been used.
Cable Ties ( Zip Ties)
Other thin wirres or cables
Step 2: Tie Straps Around Center Posts of Cars
Turn the knots inside the car and close the doors
The knot used to tie the ends of the strap together is called a "water knot"
Many sites on the web show how to tie a water knot.
If tying this knot is a problem, then consider using cable ties or paracord or a wire or cable.
Small clamps will bind cables and can be obtained at the Ace Hardware store.
Step 3: Turn Strap to Inside of Car and Close Door
Step 4: Outside View
Step 5: Anchor Points on Both Sides
Step 6: Loaded Car
Step 7: Option: Instead of Straps, Use Long Cable Ties
These are also known as Zip ties
They are thin and strong.
They can cost from 0.30 - 1.00 each and are not re-useable
But they are easy.
Step 8: Details of Cord Tied to Anchors
"Round Turn and Two Half Hitches"
Step 9: Two Ropes and Bungee Attached to Anchor
One rope is going toward the front of the load
The other rope is going to the back
The bungee cord us going ovetr the load.
Step 10: About Ratchet Straps
Here are photos of the ratchet strap and how the strap appears in the car.
Various places on the web show how to use a ratchet strap.
The ratchet strap is good fior applying downward pressure on the load
Step 11: About the Roof Pad
does all these things:
Protects the roof
Adds friction so the items don't slide
Improves air flow around the load
Keeps the load from shifting front and back