This is my first topic here. Various people have already responded to the tire discussion of the Radwagon 4 on various topics. I have also taken advantage of this and would like to thank everyone for the information.
I would like to share my experience with the tires of the Radwagon 4 that we have been using since the beginning of the year.

I used the Tannus Armor inner tube armor on both tires.
This caused a leak at the rear wheel due to a shift of the anti-puncture foam. I took out the foam, taped it and put it back again. But because the band is slightly narrower, it cannot have too much stretch. I later inflated both tires to 3 bar. And then the rear tire collapsed after use.
I'm starting to see cracks on the front tire. Hopefully that still goes well.

I have replaced the rear wheel inner tube and tire with a alternative brand. And I will pump both tires to about 2 bar. I don't think higher pressure goes well.

I may want to replace the front wheel inner and outer tire later as a precaution.

Inner tube Kenda 18-275/300 tr6

https://www.zandri.nl/binnenband-kenda-18-275-300-tr6.html

Tire 2.75-18 Kenda K254 4pr 41p

https://www.zandri.nl/buitenband-2-75-18-kenda-k254-4pr-41p-tt-tl.html

I have attached the photos of the old and new situation.