Can I add rimguard myself ?

[radioman]

8.3 gallons in each tire. The dealer had a "new chart" they had to use. After using the FEL with dirt with and without the back hoe attached, feels much more stable. Also it not so bumpy when crossing the road from one property to other.

 

[Reg]

NOT the way I wold do it with a 50+ gallon tire, but pleased it worked for you.
It still seems like a lot more trouble than through the valve and the risk of a big messy spill is almost certainly higher, but if it works it works.