Strapping a skid is easy, here is what you need to know:
Take the gross weight of your skid, and put straps on it to equal 2 x 3 the weight. The more unstable the load, or dangerous the more banding you need to put on. Basic safety factor for industrial strapping is 2-3 times the skid weight.
One thing to remember is some strength is lost at the seal. Just like a chain being only as strong as the weakest link, your strapping will only be as strong as the seal connection. Typical loss for steel strapping is 25-50%. Poly strapping loses about 50% with sand seals or serrated seals, and more with smooth poly seals. Poly welds from battery strapping tools get the best joint losing only 20%. Cord strapping looses 30-45%. Make sure you are getting good strapping joint efficiency and adjust your safety factor accordingly.
How to strap a skid depends on the weight of the skid, the strength of the strap, and the loss at the seal. Combining these factors gets your skid out the door strapped safely.