According to my research, a 2004, 2005 or 2006 Scion xA can be flat towed if it's equipped with a manual transmission. Automatic transmission-equipped vehicles must be towed using a tow dolly like part # DM9713093. I'd recommend you consult your owner's manual for confirmation.
To flat tow the vehicle, you'll need base plates, a tow bar, safety cables, a wiring solution so the vehicle taillights work along with those of the motorhome and a supplemental braking system.
For a base plate,... view full answer...
Because this tow bar has a built-in cable guide, I would go with the straight cables, part RM-645. The coiled cables might be a little hard to thread through the cable guide. view full answer...