Please check some pins, I'm sure it will helps you to choose the right one via pictures.

View more at : -https://in.pinterest.com/briansferris/toolbox-ideas/

You can read the reviews here https://www.nytimes.com/wirecutter/reviews/best-toolbox/

I prefer the wheeled tool bag as it easy to carry and handy in use. Henchman provides a wide range of wheeled tool bags at affordable prices. visit us:
https://www.henchman.com.au/CH20_dash_FMK/Facility-Maintenance-Kit/pd.php

I am using Keter Masterloader Resin Rolling Tool Box. It is pretty good. It has pros like:-
It comes with removable dividers
Made from good quality chemical polypropylene resin making it a durable one
Manufactured from the good quality frame it makes the box hold heavy items
It does not have storage issues also. By the way u can check other options also
https://theedgecutter.com/best-tool-storage-system/

I have been using the Jackson Palmer tool bag for over a year now and it is good tool box. Its size is not large, but it is enough to fit all my tools there and is made from durable material. Read more about this bag and other tool bag here https://toolboxwiki.com/blog/how-to-mount-a-toolbox-in-a-truck-bed/

Kind of surprised nobody has recommended a Montezuma box.
These have no drawers and are made to be mounted in back of a truck or van.

I have a buddy who owns a swivel pro603512 and it opens like a door. It swivels open and is super heavy duty with a 1/4 inch thick steel top. He mounted a vice and can wheel it around. www.clamca.com seems to be the link to see the details. Cool stuff for a 2in1 workbench toolbox combo.

I was given a clasp wife Kennedy Manufacturing. With a compact design and a lot of functionality Kennedy Manufacturing 18 will suit professionals and beginners equally. This is the ideal storage and organization solution for small midsize parts and accessories. In it, 18 removable bins will keep the contents safe and separate, even while you will transport this lightweight organizer elsewhere. A strong structure and a strong polycarbonate lid also ensure that the organizer will serve for many years.https://toolboxwiki.com/reviews/best-cantilever-tool-boxes/

I have a Snap-on tool box designed for the backs of vans. Like your boxes my last failed at the welds. The weight of tools and the flexing of box, van etc saw these welds fail and the box scrap.

My Snap-on is about 25years old and still as good as the day it was bought. It has the old slider rails for the drawers, so i disagree saying ball bearings are the only way. Good products designed for the job is the best way.

You get what you pay for. my previous boxes cost £100 and lasted 5 years. My £500 snap-on still going strong 25 years later. So only now is it saving me money LOL

For going on site I have an old BOSS warehouse tool box. like a doctors case, ideal and still going strong 15 years after leaving BOSS. I also have a plastic stanley box with wheels to drag in the heavy stuff. I got it from B&Q, Must say I like the plastic it can be stood on and always looks tidy. No paint or rust years later

It's true that I had not considered I would drive off with out having locked the drawers, so I had not had the problem with the drawers sliding open (over 20 years as a road tech), and as far as "center of gravity" that seems to me to be a function of what tools you put in what drawers. I do use a couple of GI canvas hand tool bags to handle the tools that I use 90% of the time, and also have some canvas bags for groups of power tools (all my drill bits and drill in 1, dremel and bits in another, soldering tools in a 3rd etc...).
My experience with where my tool boxes fail has always been that the supporting welds between the upright and drawers or the brackets that hold the drawers eventually fail from bouncing up and down over a few million miles, but in general I think it is fair to say that the box usually lasts as long or longer than the service van.

Ball bearing slides are fine if the draw has some kind of latch to secure it when the toolbox itself isnt locked.

Most of the boxes where I work, you either need to lift the draw handle, push the button, or give the draw a good tug to release the latch depending on make of box.

You could always lock it when not in use to keep the draws shut, in the UK that would be the best option anyway.

I have a four drawer about 9 " deep. I use a hand truck that folds flat if I must travel much distance. Tried the 3 drawer. I just can't get enough in it. Whole thing weighs 45 to 50 pounds. As far as a for a van, do not, I repeat, do not get the ball bearing slides. All the drawers will roll open if it is not latched. I had a big Craftsman with ball bearing slides, and had to replace the slides constantly. On other hand, my toolboxes with the regular slides have been going for 30 years with no slides replaced. One is a Craftsman, and one is a Snap on.

If its going in a vehicle, get a big chest as opposed to a rollaway, will hold up longer and has a lower center of gravity,(BRAKES)!!

Tote bag for me too, but they don't last more than a couple of years of hard use. Best one I've had is Facom. But one day the complete bottom fell out of it.....best to go through it at the end of the week and put all the non essentials back in the van. Also now I use a lightweight folding sack truck to wheel it around on, this will go up steps into warehouses too. Ideal for step jack, heavy parts etc. as well.

What happens when you have to go up steps to get in the place, like most of my warehouse customers? Two hand held boxes is how I do that and then many trips back and forth to get special tools and parts. Not fun.