Uncertain Ride

The above picture is a closeup of the front tire on my Mundo. Yup...looks like I'm about to have a blow out. I noticed it as I was putting a little air in the tires today. By the looks of it, it looks as if I swiped the tire against something (note the other marks on each side of the protruding tube), though I don't remember doing so. Who knows how long I've been ridding around like this. Anyhow, what was uncertain today was if I was going to make it to-and-fro without a flat. I did. I had planned on doing a bunch of errands today and thought about riding another bike, but the Mundo was required to carry things. I noticed it just before I left for my errands so I thought I'd ride to the only bike shop that I know is open on Sunday and within riding distance...they didn't have a tire of the same size in stock (this surprised me). The current tires--those that came on the bike--are 2.0 wide; I plan on staying with that width. At this point I was about 2 miles (3.2km) from home and didn't want to be stranded with a big heavy bike with a flat, so I rode home. But still determined to do my errands and not use my truck, I loaded a bag of tools, a spare inner tube, a hand pump, and an old tire onto the bike. The worst case scenario, I thought, would be that I did get a flat and had to change it on the spot. It's interesting in that every time I hit a bump in the road I expected to hear the hissing sound of a tire deflating...but it never happened. I rode probably about 10 miles (16km) and did all of my errands. I've been thinking about getting new tire for the Mundo for a few months now (originally posted about it here) but now there's no time left to procrastinate. I'll head over to my favorite bike shop tomorrow on my lunch break and see if they have any suitable tires in stock. If not I'll probably order these tires. I'd be interested to here from other Mundo, Xtra, and other cargo riders out there. In the previous post some of you mentioned the the Schwalbe Marathon but there are numerous from which to choose. Do any of you use these in particular? Any other suggestions? Thanks in advance.