OEM Hitch has been great, I've been towing 2 horse trailer just fine. Dry weight 3,200 and add in one animal ~1,200-1,500 so X5 has been very capable. Adding in OEM brake controller in a couple weeks for peace of mind if we add in a second horse at times.

OEM hitch + wire harness from dealership was under $400 for parts
OEM brake controller from ECS on S&D for $185

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2004 BMW M3 Individual
2009 BMW E70 X5 35d
2011 BMW E70 X5 35d - Totaled
2009 BMW M3 E90 - SOLD
2006 E53 X5 4.8iS - SOLD
2002 E46 M3 Convertible - SOLD
2006 E46 M3 ZCP - SOLD
2011 E70 X5 35d - SOLD
2000 E39 ///M5 - SOLD
2003 E53 X5 4.6iS - SOLD
2006 E83 X3 3.0i MSport - SOLD
2000 E46 323Ci - SOLD