It just on the top of Selsey common. From the centre of Stroud go out past sainsburys then straight up the hill to the common its just before you drop down over a cattle grid. Never towed it (don't tow) road gets a bit thin at one point but would think it is fine.
Hiya, I'm at Bownhill. I have a lorry but loads of people up there have trailers and go out and about and get home fine so I'm sure it's not too steep at all! Just make sure you go the way help1 says and not up Selsley Hill, you'd probably make it but it's MUCH steeper.