Need livestock trailer for alpacas

We are looking for a small, livestock trailer that we can use to haul 3-4 alpacas (about 150lbs each) and some show equipment (fence panels, feed, small products). It will have to be pulled by an SUV, so must be bumper-pull. We've heard that aluminum is best, but are not sure.



Any recommendations as to make/model? Any used units available?



Thanks

Eric and Patricia