All

Really good pictures you took from Breezewood! I thought I recognized your avatar from somewhere else haha

I would suggest getting an R6 or R6II by then as they are more professional bodies with joysticks and proper dials. The R8 will work, but smaller battery and it won't perform as well for moto with smaller buffer, etc. You could pickup a used R6 right now for about $1k which would be your best investment to get you into mirrorless and use it with your 70-200 f/4. You asked about a 135 f/1.8, but I would suggest the 135 f/2 for Canon as it's a great lens for moto and portraits. The R6 can do it all for...

I currently have an R8. I bought it to use for landscapes and wildlife, and I was gonna continue to use my old Canon 40D for action. But, after being blown away by the incredible dynamic range and high ISO performance, the 40D is retired. The R8 works well for action, but there are better choices. Such as the R6 which has higher FPS and both front and rear shutters are mechanical.

50mm f1.8 . . .

Depends on the situation but when I'm at the local track I use my Canon EF 135 f2 L quite a lot. I usually shoot it wide open because it has really nice bokeh.

I’ve been using a 135 1.8 on one body and a 300 2.8 on the other. Sometimes I’ll use my 70-200 2.8 instead of the 135 though. I like to pair the 300 with a 1.4 or 2x TC also.

We actually tend to use the 100-500 most often. The 70-200 really only comes out of the bag when the light goes away…