I decided to go back and steal that truck again.
I could still see it from my Watchtower in the same position that I'd left it and, although all the baddies were now up and wandering about once more, the truck was very close to the limits of their scanner so....
I retreated to other chap's base, put my important cargo in the private locker and then went a-sneaking knowing that I wouldn't get pinged on their scanner if I wasn't carrying. And I got it!
And with all these useful wheels at my disposal I got all my goodies back, loaded it up and set off driving and-
Two minutes later I'm back on foot again.
They spotted me from miles away and now I'm blurrily hiding behind this rock so that the yellow guys can't find me and the important thing on my back.
It was a bad idea. There isn't really enough space over this terrain to put your foot down and accelerate away so we're back to walking again. Thankfully this time I did find a decent climbing path to get back to the old guy and after delivering some lost items for him I started to make my descent down the other side and saw some friendlies.
I do have some lost cargo for a new person that I haven't found yet but I'm reluctant to go searching at the moment as I don't have any grenades if there are any creepies around thanks to the old guy not wanting to fabricate stuff. So a stop at the Engineer's place is next.