Hi GlosterMB,
i use a brian james car trailer and can`t fault it at all, if you have alternative uses for it a plant or sided trailer is the way to go (though it is easier to push on to a car trailer if need be) depending on storage available and of course price. For the weight get a twin axel and if our buying second hand check the axel weights on the data tag and stay away from "home builds"
Nose weights can be measured by scales brought from caravan accessory stockist but the nose weight can be adjusted by which position the vehicle is placed on the trailer but do get it right.
If you have not done so yet find plenty of room to practice reversing.
Cheers
Ashley