[quote=ASTA]
Yeah, mostly this. However, I had no idea people were trying to pull machines that tall into the RP. I just went with a basic height of a modern tank since that's what the mechs are supposed to be, I guess? Equivalents of tanks?
[/quote]

The idea I've always had in my head was that mechs and mecha were to fill in a niche that couldn't be filled by wheeled/treaded vehicles at all; something with the firepower (at least) of an MBT, but with the mobility and maneuverability of, well, something with legs.
I've been talking with Tentacle and he hashed out that that's why mechs, weapons systems that are a good deal more expensive and fiddly than (relatively) simple tanks, have become the premier fighting vehicle in the Junkyard; although tanks, APCs, IFVs, and other conventional vehicles are still used, mechs rose to the forefront due to their utility in getting around the Junkyard. They have the ability to get through places that, before the advent of mecha, were limited to infantry (which seems to be what ninety percent of the Junkyard consists of; assorted wreckage so thick it'd be a guerilla fighter's wet dream), while still being able to bring to bear the devastating power of a conventional tank.