if you go with the hmmwv wheels i'd stay away from the runflats that come in them. they are super heavy (20 lbs each just a guess) and a pain if you do need to get them out. i just pulled some out the other day and it was a big job. i don't know how one is actually supposed to get them out but i used a ratchet strap to squish them down then a rope hanging from the celling around one side and jumped up and down on it till it popped out. took me about 3 hours to break down 2 wheels tires and pull the runflats out.
yes, good if you have to take it completely apart on the trail for some reason because you don't need any special equipment, but i'd deff go with the pvc inserts. just something to think about.