I would be getting some fabric paint on that trolly sharpish,although the principal is spot on,I remember John Wilson used to have a Folding Rucksack /chair thingie and they are pretty good and still available
I Think the key is to know what species you are going to Target and take the stuff with you for that species,you can always adapt e.g an avon rod will do most things,chub,barbel,bream,tench,light carp work,light piking,perching,
My personal experience is the same as I used to carry everything to the bank in a gigantic match rod bag,a big Box on my back and a holdall in my hand
I now do the following:
Pole Fishing(which i dont do nowadays much)
take the box as it can store everything inside,pole and a few other items in a small pole holdall
All other fishing I use the small chub zip up
look hereand i have a few of these for the different types of fishing e.g.
one with floats,shot,hooks etc
one with leads,rigs on a fox winder,hair needle drill etc and all rig bits in a small box given away in AT about 2 months ago
One with all my pike bits in(that is a larger one )
then i have a roving bag that always has scales,polarised glasses,rod licence and cards,camera,screw top pot of tea bags and same for sugar
all I add is the right chub box and bait ,flask of hot water,500ml coke bottle full of milk and I am ready to go
My chair carries a screw fitment for a rod rest and a weigh sling/unhooking mat combi stuck in the back of the seat secured with bungee straps
All i need then is the rod and the rest for the chair and my landing net(see pafex net in reviews)
Obviously you have already bought the korum chair so your going to stick with that -but try the rest as it is rewarding to know you can drop in or move out of any swim you fancy .
Last Monday I even got out an 8ft spinning rod and strapped to my bike like i used to do when i was a teen and biked down the river to look for some new swims,I was knackered but it was refreshing