What is the weight of this in kilograms and is there a way to tighten/loosen wheels to make it easier or more difficult to push?

Hi Pet, thank you for your inquiry, the Cargo Walker weighs 5 kilos, We have not tried changing the wheel tightness to change wheels movement on this model, But in theory it should work. Note if you loosen the wheels too much they may fall off. We hope this helps. if you follow the link https://www.babyonthemove.co.nz/store-locations/ this will take you to our online store finder. Here you can find contact details for your nearest Baby On The Move Store where one of our team experts will be happy to assist you in your product search and help answer any further questions you may have.