Mines 9 1/2 years old and I took the rear mud flaps off and it had started to go where the plate sandwiches onto the rear x member. However, I removed them, wire brushed the area and liberally sprayed lano everywhere, its now beautiful again as the rust had only just started. I do pressure wash it vigorously almost every week, and I pay extra attention the the crossmember where the a frame is attached to as i know that they can get badly neglected, and mine is my everyday work vehicle too.
I would probably paint a galv chassis to if I did one again, at the time I needed it back on the road ASAP, and to be honest I'm pretty happy with it. Mine was a Marsland one too.