Many coaches have "class" problems. For the Neptune and Cayman of this era, they are:
1) built on the lowest-end Roadmaster air-ride chassis, the R4R or RR4R. The trailing arms on these chassis can fail. Replacements are available at a cost of around $2500, plus labor to install them. There was a recall; some coaches may have the fix already applied. Some owners spend another $2500 (plus labor) to install a kit to improve what they consider to be a rough ride.
2) are prone to slide floor rot. This is a well-known problem; there are lots of threads on it. The floor will be mushy when pushed up from the outside, and there will be a gap between the white plastic material and the lower edges of the slides- the gap being the place were water gets in. The gap allows the plastic to tear, too. This can be fixed, and Guardian Plates applied.
3) are prone to clear coat failure on the full-body paint coaches. Damaged areas can be sanded and repainted. This does not apply to coaches without full-body paint.
4) can leak along the wall-roof joint.
2008 Holiday Rambler Admiral 30PDD (Ford F-53 chassis)
2009 Honda Fit Sport