I've used one like this for a few festivals. They are ok with a decent load but do need a second person going across hills or uneven ground to stop it toppling over. Also you need to cable tie all the clips in place or they will definitely rattle out, especially when unloaded. I lost a couple of clips the first time I used it in 2017 at Glasto but managed to pinch some replacements off of exactly the same trolley lying wrecked by the side of the path.