I think I know where you are and I think your very much stuck.
I got stuck in there with a raptor thinking I could walk to the top from the inside.
You can only go as far as the hole. My raptor was able to jump far enough to get out of the hole. A can't see a trike doing that. Only ither thing to do is die and use a flying tame to get back fast to collect your stuff. As for the trike. RIP