Forgot to add some stuff. When I pulled tires, I found multiple thorns in tires 8+ in each tire. But only 2 got thru on tires, so a little prop for tire toughness. Found a you tube video on using a small knife to get out the thorns when changing the tubes and it worked wonders on getting all of them out. Both my tubes were replaced and when I put liners in wife's bike, I found a small leak there so replaced her front tube also. Thank goodness I timed it right that Amazon actually had Mongoose 26X4 tubes.
BUT, the thorns were all in the flat areas between the knobs. That's the issue I think. There aren't enough knobs on the stock tires to keep them up off trails enough to protect from punctures. RAD should either put liners in them from factory or give an option for different tires for folks in areas with thorns and other off trail riding conditions. These tire are probably good for paved bike trails, but I have serious reservations for dirt trail use. Depending how things go with this upgrade on liners in spring, I may replace tires to more aggressive tires for more protection.