1/8 is where it's at for me too.. easily the most versatile scale I find.
Just yesterday I had a great session on my backyard track, ERevo, Kronos xtr and the ET48. All running 4s, fast, faster, fastest.. the E Revo is a cool rig, but it'll never handle like the others, I've been throwing everything I can think of at it, much better than it started, but it's just a different animal. The ET is poetry, an amazing rig. I even blasted a tree, cringed, that hurt. Nope, drove away without a peep.. I also have a K6 exb, which is running Mojave arms, cvds, it's a blast, kinda like a TC Asuga, about the same dimensions. Takes a bit more concentration to drive vs truggy, likes to traction roll, but still more ground clearance and width compared to a 1/8 buggy.
Well, you could line it with an old towel or something, then put the rig in upside down maybe?
The 40 gallon size says it's 22".. but I would definitely bring a tape measure with.