You extend the foot plate out and there are 2 upstand bits, the same as the normall on box trolleys. The box sits on these to keep it secure, then chuck net bags, rollers etc onto the extended footplate. Bag at the back, Rod bag on top, then I use 2 Fox bungee straps, one at the front and one at the back – job done!
Word of warning! do not wheel the trolley fully laden and drop it down a kerb. Me and a mate have got through 3 wheels doing exactly that, though Preston say they have sorted this on the newer models, the plastic seems exactly the same to me????