Vehicle recovery

[Imp]

There's tons of maps where it's practically impossible to avoid tough terrain, like rough slopes running from end to end ... in several rows

Never come across one that does not have gaps or a couple of hex longer path where you can avoid the slopes, driving over rough is not a problem. Again its a judgement call if only has a few safe places to cross do you risk getting stuck or head for them as the other player is expecting. Do the second probably arty waiting so now do you weather it or risk getting stuck by going flat out. Its all about choices the terrain is working against you, take the risky route for getting stuck or use the adjacent hex but give him a flank shot.
Decide the biggest risk & make your call.
Getting stuck is annoying but it plays a major part in your tactics for that map, switch breakdowns off & your whole plan could change.
Its part of the package mistakes are punnished be it planning combat errors or just not looking at the terrain you are heading for.

Told a lie have played a few maps bad combo of mud swamp streams but the result was you could count the number of vehicles we bought on one hand