My opinion: RUN, don't walk away from this one. We had a Harney and it was a disaster.
Firstly - the brakes are mechanical, NOT hydraulic. In an emergency stop, you have to literally stand on the pedal with both feet to generate enough brake power. Also, they had a tendency to have calipers freeze; one requiring us to be towed to get it fixed.
Secondly - they were prone to multiple water leaks.
Thirdly (if I remember correctly) their chassis is a proprietary design. Not many places where you could get service on them.
There are a lot of brands out there that are well known and noted for their construction: Tiffin, Newmar, Monaco etc etc etc.
Stay away from Harney's
Mark & Sheila Heilman & The 3 Fur-Ball Princesses - Nikko, Mai-Thai & Andy
'07 MADP 4523, 2012 GMC Terrain SLT 2 wd
Blue Ox Alladin Tow Bar, M&G Engineering Dinghy Braking System