"I'm just not sure how they'll be treated by the baggage handlers and if this is a bad plan." - That's the thing, you can't really say how you will be treated. But usually they are OK, especially if you come for a touristic place (tourist buy lot of large stuff). For cabin luggage, they may ask you if you are fine with that; and it should fine unless you have a transit and a plane change, make sure that final destination is indicated. Buying a long luggage that can fit the tube with resolve your problem.