Yes, I have. We had a SART/SARN nurse come in during paramedic school who went over them with us. She showed us a evidence collection kit, and explained what happens during the exam. It was really helpful to learn how the exam is done because it makes it easier to plan for what they need. She also went over how to deal with the patient emotionally.
Her thoughts were that unless the pt has been seriously injured and needs bleeding control etc that what we really need to do pre-hospital is provide emotional support, write down anything the pt says, don't question them, let them lead the conversation, and help preserve evidence.
The biggest thing is that all of the pts personal belongings need to be looked after since there may be evidence on them. On a suspected SA (or even a serious regular assault), NOTHING of the pts touches the ambulance floor, it is placed either on the gurney with the pt, or in a paper pillow case*. This helps prevent cross contamination. Once we move the pt to the hospital bed I also carefully fold up the sheets (which are paper) so that anything on them ends up in the middle, and then those get placed in a collection bag.
*I honestly don't remember why now, but paper is better than plastic. I think it has to do with evidence degradation.