normally trailer load must be over the axles and with a little front end heavy, this will stop pendulum effect and your risk of losing all.......... just make sure that it's not tail heavy as it will sway badly...... it can also depend on how your trailer is constructed as it may be contructed and be nose heavy before you even load it with a car.
i have the choice as the race spider is perfectly balanced i can load the car on frontways or rearways as long as i keep it centred over the axles and it drives perfectly at a good speed.
i've also had a GTA on the trailer and i loaded it rear end first to be on the safe side, it towed well with no problems.