Lisa,
 
My husband is pretty sure he can make a cart for your 5 pounder, we have
a son in a wheelchair and he is always making things to improve his life,
there is no guarantee but he said he will see what he can come up with
this weekend and if we think it will do the job we will send it to you,
free of charge.  I'll be in touch.
 
Jackie(Phoenix)
[Posted in FML issue 4030]