Anyone connect totes from front-to-back?

Due to an annoying space constraint. I need to position and plumb these IBC's on the narrow side (as seen in the image - gap is exaggerated). Has anyone else been in a similar quagmire? My thought was to drill a 2" bulkhead fitting in the rear of one tote and use the valve on the front to connect to the next tote. Likely include some threaded unions between for disconnection/servicing. Any experience or advice to avoid headache or improve my approach would be appreciated. I'm stuck with the location sadly, and thus, this will be my orientation. Don't suspect I'll find a more suitably sized container for the relative cheapness of these ubiquitous IBCs.

Appreciate the time.
Cheers.

Mike you can link them in the manner you speak of but the total cost of all the fittings may alarm you.
Also, dont forget to use flexible tubing.
Can you use the valve on the second one and run the tube alongside the front tank.

The cost of those thru-tank unions, clamps, hoses, valves, adds up pretty quick. Is it still a good deal? And if any connection fails, you lose everything.

Why not have a top-fill system that you can make from anything, and a couple of cam-locks + hoses that you can move around in 15 seconds to drain the tanks of your choice? My 2c.

If there is any chance they'll settle or frost heave, I wouldn't attach them to tightly together back to back.  Fitting a bulk head fitting into a tank where you can't reach the inside of the fitting could be a struggle.

If you can't run the connecting pipe along side the tanks, could you run it under them?  Lift them up a couple cinder blocks high and have each tank do a 90 degree drop down to the pipe.