Yes, there were some bad axles, but most were replaced or adjusted. Check the date code on the tires, if they are brand new, then you can't really know if the axles are OK. But adjusting them at a good axle shop is less than $200. If they are older than 1 year and wear seems balanced, then axles are OK. If the tires are more than 3 yrs old, they should be replaced for your safety.
There was a frame issue, really the outriggers, which are the thin, triangular braces that extend from the main frame and support the outside walls. Welds will break or the outrigger will develop a hairline crack at a 45 degree angle starting at the upper corner of the outrigger. You will need to wipe dirt off the outrigger and a flashlight to do a good inspection. Failure allows the walls to sag a small amount. EZ fix to weld thicker steel onto the existing outrigger and not very expensive.
Otherwise, these units were well built and you just need to inspect for excessive wear and tear or inadequate maintenance.
Sold my '04 29RK in 2011 for $12k and helped another forum member buy one recently, he paid more than $12k. So, if the unit is really in good condition, then the price sounds good.
Texas Baptist Men-Retiree Builders member since '01
13 Silverado 3500HD D/A, 2wd CCSB srw, custom RKI bed
11 Cruiser CF32MK