So Magehand can be cast in that wagon cart? Or did you cast it on a crate or ground?
On the ground is fine ...
I wonder how did you people managed to miss it, i writed this tip to every single topic about "unreachable objects" i found since day 1.

With the unreachable potions: Eventually it is possible to throw them to other Characters to avoid breaking them?
Nope ... if you throw potion "at someone" it breaks too ... and your target will imediatly take its effect.
But once you can throw it, you should be able to relocate it by simply draging.

Well i normally use another kind of "Throw", its Thunderarrows. But this might destroy sometimes low HP Chest/containers.
And when i use Magehand, and its not working on several attempts i dismiss it.
Becausei dont want to waste too much time for some items, which i can most of the time just steal from a Trader-/Merchant NPC.
In any case i think this is a particular Patch5 problem and will be gone in near future. LEss problems with unreachable in patches before.
Also more Ladders / climb options are broken too in PAtch 5. Guess that its somehow connected in Mapbuilding and Rendering Maps.