Its all luck of the draw. I've gone years without getting a flat and then I've driven over nails twice in a week. More than anything I'd suggest bringing along a can of "fix-a-flat" to at least get you to a tire shop.
I recently installed a Kicker solo 8" L5 into a 0.4 cu.ft box, powered by a Soundstream 4.480 amp, into the spare tire well. It pretty much rocks the haus.
As for no spare, I guess you take your chances w/o one. As Lexi said, tho, get a can or two of FixaFlat for safe keeping.
A forum community dedicated to all Volkswagen owners and enthusiasts. Come join the discussion about performance, builds, modifications, classifieds, troubleshooting, maintenance, new releases, and more!