Best camera/camcorder for Trial/Motocross videos

[redline2097]

Hi!

I am looking preferably pocketable/lightweight solution to shoot videos of my boys Trial and Motocross training. I would like to use same camera for general family photos and videos too. I need good autofocus which is capable for these kind of situations:

) I am on back of 50m bumby straight and my kid drives towards me at 20mph

2) I am on side of track about 10 meters away same speed and he drives horizontally past me, I would pan when he goes.

I have now Oneplus One and I get footage like this:

Things I absolute need:

-Good AF
-Good stabilization
-Moderate low light capability
-1080p 60fps

Things I would enjoy too:
-Pocketable
-Good 1080p 120fps
-Good HFR
-10x optical zoom, 200mm would be enough

I would love to buy RX 100 IV but is there any way I get this kind of shooting via autofocus or any other method with it?

I have also tought these cameras:

AX53
-Bad low light
-Photo quality?
-Does not fit pocket

ZS100
-Soft lens
-Mediocore video IQ
-Bad 1080p 120fps

GX85
-Size
-I need at least two lenses
-Autofocus? 

[IronFilm]

 RX 100 IV / RX10 mk2 / X70 / AX100  would be my top votes for you to consider.

Many mirrorless cameras would be good choices too, but sounds like you're a much more casual shooter, so I'd recommend one of the ones I just mentioned above as suiting you better

[redline2097]

Autofocus of RX100 IV can keep up on this kind of shooting? 

Any tricks how to get best footage with it?

[Michael Coffee]

a6300 with a sony E 18-200 would be killer - big lens though and a pricey combo..