hi rb'
IF axles, hubs AND brakes are needed, it's a great time to consider a modern disc B system.
especially with a somewhat marginal tow vehicle (no offense)
it's NOT that much more $ in the grand scheme and IF the units gonna see much travel time.
others with that year trayla have done this and are happy.
here's a few threads relevant to your needs, with USER reports and going back many years....
http://www.airforums.com/forums/f439...kes-28403.html
http://www.airforums.com/forums/f439...kes-29208.html
http://www.airforums.com/forums/f439...lla-31006.html
http://www.airforums.com/forums/f439...ems-23688.html
http://www.airforums.com/forums/f439...kes-38474.html
http://www.airforums.com/forums/f439...akes-4243.html
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and while 70s oem type axles can be had, MANY folks here have purchased the CURRENT OEM brand (dexters) axles...
for a lot LESS MONEY and with good results.
search the axle threads and you read a LOTa heat/bs/tension on this issue...
but i trust the buyers/users reports more than the vendors/sellers on this topic.
both brands come with a manufacturer's warranty,
but ONE of the companies may not be in the trailer axle biz much longer...
cheers
2air'