If you are mainly worried about your guitars then you should have a look at acoustics with laminated necks. Martin makes a series of low-cost guitars with lamin

If you are mainly worried about your guitars then you should have a look at acoustics with laminated necks. Martin makes a series of low-cost guitars with laminated necks that are actually quite good! The fact that the neck is laminated makes it less prone to warping as the different pieces of wood will absorb moisture in different ways and help stop each other moving, making the neck more stable over all... They use the same concept on rifle stocks. I can't say I blame you for not wanting to take your Les Paul on a boat! * I used to work for Gibson in Australia