It's not very triangle heavy, the 1st LOD is 2,496 tris and 2nd LOD has 1052. That doesn't seem like alot. The 1st LOD is a beveled version of the 2nd and looks better. If you want i can decrease the distance it takes for the LODs to switch, and decreasing the CPU load. Also, i think decreasing the amount of bars on one side would make it look out of proportion.
The axis with more bars has around 4 for every 1 on the other axis and that's what i followed.
If you want i could make a third LOD that decreases the number of bars.
