Conti tires
 

Is there a long lasting and puncture resistant continental tire? My understanding is that the Schwalbe marathon tires have all of these features but I would like to ride a 700cx42mm tire and they are not available.

Actually would like to ride the 45mm tires (for heavier loads and softer ride) but according to the Surly web site I will not be able to use fenders with this size tire on the Disc trucker.

Any other brands in 42mm that have the same qualities I am looking for? Also, has anyone used fenders with 45mm tires on the Disc trucker...maybe I can have the best of everything if the 45mm tires fit with fenders.

Land mines are powerful bombs.

Conti makes a 42c Top Contact II:

Continental Top Contact II 700c Tire at BikeTiresDirect

Unlike the Contact II, which is made in China, the Top Contact II is made in Germany and is stronger and more puncture resistant. I did a tour in MT a few years ago using Top Contact 37cs. The route included over 60 miles of unpaved roads. More than 20 miles of that was very rough in places. No problems. Going back there in June so I just ordered a set of 37cs Top Contacty IIs yesterday.

Personally, for road touring, 45c and even 42c seems like overkill. I did crossed PA in September via the GAP, the abandoned PA Turnpike and paved roads on 32c Contact IIs with no problems. But to each his own.

my only concern is at my weight I need to get close to the max tire pressure of the tire so I may need to go with a wider tire. I am not concerned about the speed of the bike but have concerns about punctures and blowouts from weight.

How much do you weigh, if you don't mind me asking? I am about 210 lbs. While I don't try to overload the bike, I carry more gear than some/many. I have always run my tires at the max pressure of 85 psi. with no problemos.

350lbs without any gear and according to those tire calcs I need to set my tire pressure over 90 rear and 60 front. Assuming 20lbs of gear at 60/40.

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.

currently running 40mm tires but cannot find a shop selling 42mm. Anyone have a link to a shop selling the 42s online?

I have had good luck with Continue Sport Contact 700x37c and Vittoria Randonneur Hyper 700x38c and I am down to 280 from 345.

These look appropriate

Continental E.Contact 700c E-Bike Tire at BikeTiresDirect