https://youtu.be/7oyWbNyskpM
I fixed similar problem for vanilla vehicles via removing crazy friction values for creep tiles originated from K2, but RA's vehicles are still facing bad experience.

Vanilla vehicles:
***Car
friction = 2e-3
braking_power = "200kW",
weight = 700,

***Tank
terrain_friction_modifier = 0.2,
friction = 0.002,
braking_power = "800kW",
weight = 20000,

RA:
***Adv car
friction = 0.02,
brakingForce = "250MW",

***Nuclear car
friction = 0.06
brakingForce = "30MW"

*** Adv tank
friction = 0.006
brakingPower = "3MW"

*** Nuclear tank
friction = 0.06,
brakingForce = "80KW"

I created a PR.

Hi @garrotte! Ive seen your mods and they are cool. It seems you focus very useful, but often ignored issues, like this one.
If ever you make a mod with exactly this that you mention here (removing friction from (stupid! XD) K2 creep), you bet I will download it.
The issue I have with making these changes, is that I might forget to do them every time K2 gets updated :(
But I've seen your questions in other mods, and I almost always agree with your points.

Unfortunately Veden doesn't update this mod, he hasn't merged my changes of friction. The same about overpowered incendiary/poison shotgun and bullets ( https://mods.factorio.com/mod/RampantArsenal/discussion/62e1620463d2f3ca4242854e )

The mod version here (at mods.factorio.com) is obsolete and too easy to play. Veden didn't release updated version. I use the one from github with these two fixes added.