The only catch I could think of is the XM service. At least for XM
music services, the typically quoted service rates are for "personal"
use, not for bars, retail stores, salons, etc... I've never seen an XM
WX service contract, so I don't know if renting the served unit is legal.

I would think, that as long as each unit had it's own XM subscription,
that wouldn't be a problem.