Mareh, I'd try it. As long as you can stay within the weight limit it should be alright. LH in my experience is more of a stickler for weight than for size. I'd also trust them for gate checking. No worries there. A rolling bag would have the advantage that you could put your hand bag on it. This way you could have a relatively heavy hand bag at around 8-10lbs which you won't be able to carry comfortably otherwise (according to the arthritis thingy).

Till