Originally Posted by corwin1968

I would say wider tires are a good idea for a heavy person. I weigh 400 lbs and blowing a tire is not something I have ever worried about. However, riding a tire with a low enough pressue to cushion the ride and protect the rim from impacts, without pinch flatting, generally means wider. I've been riding 40mm Schwalbes and wish my bike could handle 50mm tires.

In regards to your original question, Schwalbe has plenty of 40mm touring tires. I just made a list for my own purposes:

Big Ben 40mm
Marathon 40mm, 47mm (might actually fit your bike..Schwalbes tend to be smaller than their listed width)
Mondial 42mm, 47mm
Supreme 42mm
Dureme 42mm

Rim width will make a difference in the final width of a tire. My 42-622 Duremes say 700 x 40 on the sidewall but actually measure 39mm (by caliper) on a Dyad rim, which is a fairly wide rim at 24mm. The same tire might be several millimeters smaller on a narrower rim.