I wouldn't be tipping the printer more than a few degrees - I reckon you could safely do it enough to navigate a 30" door but no more.
That said, the printer is closer to 30.5" which might make enough of a difference. In the US, it seems that 30" and 32" are the standard sizes with 32" being the ADA recommendation (American Disability Association).
If you're talking about moving it in and out of commercial properties you could have any size door, but the more modern the building the more likely it will be wider.
Regarding transport - I'd highly recommend boxing and proper packaging for frequent or extended transport. A flight might seem like a more extreme movement than by car, but you can bet they're properly packed for air shipment and most of the time the ride is probably smoother than some roads.
A proper box also helps to reduce dust and other issues (blankets present fibres, static and other things to be avoided, imho). I also wouldn't leave it in a car in high temperatures once there's ink in the line (remember, temperatures in cars can soar with even just a little direct sunlight).