For a cheap and quick down hill version get one of those large blue barrels cut along the mould line(less than 5 min with an electric saw). Add children and a slope(dad did somthing right for a change)
I expect with a few well placed holes a bit of rope and half the lid it could be used to pull your kit as well.
I had a barrel marked for 100Kg great for a 12 year old not bad for a 47 year old but really need a bigger barrel SWMBO going shopping on monday for one to fit her.
Good luck dave