We have tried 2 different rear axle assemblies and neither works. Our 1984 New Horizon has a 5 lug assembly that ground to a halt 20 minutes after purchasing the rig - we have scoured junk yards and Craigslist, we have purchased one and swapped it for another and neither worked. Where is the best place to locate one - and how should I start my search - what do I need to ask for?