Is your trailer still available? Does it have the spare tire ?
I have one of these trailers and have not seen one with a spare. The idea was to have the bolt pattern match the van and share the van's spare.
SOLD04 EB350 Custom Floorplan
6.0 PSD 4.10 Posi
Salem Kroger coil spring 4wd
SMB Trailer w/AT Air Suspension
Alaska to Key West, Labrador and more
130685 miles 16.65 mpg average
Prostate cancer survivor. viewtopic.php?f=8&t=11099
2015 VW GTI
Leaving CA for WA
Mine came with a full size spare and matching wheel. They hang between the tongue and axle. It's possible the cable jack that lowers the tire is there w/o the tire. I'd ask. I've seen one that used that space for spare water tank.
2006 Ford 6.0PSD EB-50/E-PH SMB 4X4 Rock Crawler Trailer