Another option popular in the construction industry is foaming your tires which gives you the benefit of weight as well as tires that can't go flat. This is the next step beyond simply using windshield washer fluid or beet juice which has been done for decades.
Flats never seem to happen in good places and the hassle of dealing with the liquid mess only makes it more difficult and leads to more downtime.
I do this to my tractors and to equipment that I use in the woods moving logs. Every now and then someone will notice one of the nails and screws in my tires. It's nice to not have to worry about flat tires on equipment.
Here is some more info.
TyrFil(R) Tire Flatproofing • Accella Tire Fill