Thank you for the replies.
The sidecar dimensions are 8" Long x 5" wide x 5" High
It sounds like the stryker is the wrong way round for me.
I'll need a small wheel at the front for direction and the drive spindles either side of a slowish (T70?) motor in the rear.
To give an idea of my relatively simple skills here's a 1:6 (Dragon) Jeep I'm converted using an Electix Boost RC chassis I modified.
This has a T70 motor in it to give the slow Jeep like response.
The lights (LEDs) work whether the trailer is attached or not. when attached they work on my scratch built trailer too.
Bern