CB works well when stationary, not so much when moving

I figured I better try and get this figured out. Since I've been using pilot cars in MT alot. I've not had great luck with the CB last year. When doing radio checks before moving out, everything is great. Once out on the road, I can hear fairly well, but I come across as scratchy, and not able to be heard well.

I've got a Uniden PC68 in the truck, with two wilson silverload antenna's, ( they SWR's out great one is almost 1.1 and the other was a 1.3). I'm also running dual strobe beacons, which do come through the CB with the squealch down low enough.

I'm thinking of putting LED beacons on the truck, to see if it helps. I don't think the LED's will help the stationary, vs. moving bit though.

Wondering what the experts here think?

 

I kinda forgot about this post (notifications don't seem to be working). Unfortunately I won't know until April-May when I get back into the truck. That time can't get here fast enough.