You'll find the info in easy searches for ansers that have been
aorund for long times and short on both wheels and slings at
http://listserv.cuny.edu/archives/ferret-search.html  (Complete FML
Archives)
and
http://fhl.sonic-weasel.org (Complete Ferret Health List Archives --
the posts form when at Yahoogroups and while at Smartgroups.)
 
Have a virus and not getting much sleep btwn Chiclet's needs and the bug
so forgive the mess but I checked the URLs and they are fine and woring
 
Example of something we've been making for a good many years:
http://fhl.sonic-weasel.org/browse.php?msg=YG461
 
>Here is  a trick that often helps with quality of life:  make a panty
>hose sling.  Choose the pair based upon your height since you will
>use them more if you don't stoop. If household members are different
>heights just color-code personal slings by buying a variety of
>colors. place one foot of the panty hose flat on top of the other and
>sew them together to make the hammock for the ferret's belly.  Then
>roll down the top and sew it together to make a handle.  Place under
>ferret's belly and take walks together inside!  Don't be surprised if
>the ferret tries to run so you may have restrict that in some cases.
 
There are multiple options for wheels and what works best depnds on
the ferret: surfboard like ones with castors (need the 360' mobility
to not topple), light weight rodent cages with two ends and bottom
removed, castors attached, and hammocks and sometimes tail slings hung,
professionally made ones like form Doggon (but a weak ferret also needs
the front extender), etc.  so the searching will help you.
[Posted in FML issue 4196]