To my knowledge, Honda has not done any durability testing of aftermarket striping kits, so there's no firm data to say one way or the other how much more wear or reduced service life from the transmission could happen. Dragging a heavy roller behind the mower will of course put additional load on the engine, belt, transmission, etc., but without some extended hours testing and measuring very closely both a modified and stock mower in the same environment, , it's anybody's guess how much more wear-n-tear will occur on any of those parts.