How much does putting something on wheels change it's weight when being pulled?

Question

I tried googling it but everything relates to cars!!!

Context:

A friend of mine is very interested in strong men and their spectacular feats of strength, pulling boats, cars, ect...

And I have the argument that there has to be a catch to it, like it's possible it's all a scam?

Because it's all on wheels... So I mean, how much weight are they actually pulling?

Answer 1

"putting something on wheels" does not reduce its weight. To be precise, it increases the weight due to the added weight of wheels and support hardware.

On a level surface, the horizontal force required to push or pull something is the product of the weight and the coefficient of friction. Having wheels reduces the coefficient of friction.