For sale are 2 USED Wolfcraft firewood stackers.
Here is the Amazon link for one, so you can find more information about it:
https://www.amazon.de/Stapelhilfe-5125000-Verstellbare-Kaminholzaufbewahrung-Au%C3%9Fenbereich/dp/B00O7HUSOU/ref=zg_bs_g_4339845031_d_sccl_19/257-4811834-4058757?psc=1
As you can see on the picture, it is extendable, so you can choose the length that best fits your needs. I put a regular 33cmX16cm log on each side to give you an idea of how much wood can fit in it. We had both of them in a shed, so they were protected from the elements, but you can also have them outside, with a tarp on top.
Priced to sell--30 euros for one or 50 euros for both.
Item located in Eppstein (65817)
Thanks for looking!