I think I'd do a little customizing on a storage rack that fits in the receiver hitch...you can buy them at Walmart or Harbor Freight, and adapt it to fit the trike, which would be tied down to it.
Maybe someone has already done this, and can show pictures, to give you something to work with.
Good luck
Bill & Claudia / DD Jenn / DS Chris / GS MJDogs: Sophie, Abby, Brandy, Kahlie, Annie, Maggie, Tugger & Beau ๐RIP: Cookie, Foxy & Gidget @ Rainbow Bridge.๐2000 Winnebago "Minnie" 31C, Ford V-10
Purchased April 2008:B FMCA# F407293
The Pets