Heavy Vehicles Addon 1.0

This has been on my stash for about half a year, maybe more, but I feel like today's a good time to bring it to the world.

This mod adds plenty of weird experimental parts to the T-Series, MD-Series and semi trailers, mostly for my own convenience. There's also partial support for EFC's Twinsteer Addon.

T-Series:

1. Auxiliary fuel tanks and sleeper cabs for space patching
2. Lowered tandem leaf springs
3. Rear tandem axle adapter for rear frames usually restricted to single axles
4. EZ-class gearboxes of different types ranging from 8 to 24 gears, with customizable shifting layouts and matching shifters
5. Legacy gearboxes and final drives similar to the 0.30 T-Series' powertrain, with version-accurate gear ratios and final drive ratios
6. Certain addons for the vanilla 14.7L I6, such as extra rev limiters and a naturally-aspirated intake.
7. Disc brakes for all axles, both airbag-dependent and hydraulic/airless

MD-Series:

1. Janky but functional AWD front axle and transfercase
2. Slightly strenghtened driveshafts for debug purposes

Semi Dryvan Trailer:

1. Dual bogie adapter for the 28ft dryvan

Common:

1. Limited-slip differentials for all powered axles and transfercases
2. Hydraulic/airless brakes for the T-Series, MD-Series and trailers

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Known Bugs:

1. There's a set of airless rear suspensions for the T-Series left over. I'm planning to replicate the 0.30 T-Series' suspension system, but so far everything's unusable and might break the vehicle. I don't know how to fix them and make them work, so if you pull it off, please let me know.
2. Combining airless T-Series and air-dependent trailers can cause the air pressure values much more prone to go runaway. I can't fix this either, sorry
3. Using any non-automatic gearbox with EFC's Main EV Motor will break the T-Series. This is specific to EFC's mod, so I can't do anything to fix it; I added an EZ-Bolt single-ratio automatic to try and sidestep this issue until it gets fixed.
4. Pairing the EZ-Twin gearboxes with a soft-limit rev limiter can cause the gearbox to stop upshifting and get stuck, requiring the user to either slow down or engage manual shifting mode. I added Hard rev limiters to sidestep this.