To avoid skin irritation on saddle straps. Secure it with a couple of zip-tie plastic straps to prevent slipping. 1/2 inch foam pipe insulation.

SPECIAL DESIGN

It's an "elevator" cart.  The cart can raise and lower the platform for the dog to fit in it.  I would say this was a "challenge", and here is the "solution".

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Chay in New York.  He is a 90 pound G/S.  The 3 pics by the blue bottle are the studs and twist on wing nuts that are used for the rear "adjustable saddle straps". They bolt together with 6 bolts and it cut the cost of shipping to $25 for the same size cart going to the same location.

This is a "knock down" cart.  You can see how the back section bolts to the side rails