I had one of these. Was as good as my previous coast to coast. I recommend it. As @twscoot says, these type dont last no matter how much you pay, just get a new one every 2-4 yearsI bought the 22 foot version of this off eBay.
You look to get two years from them then turn them over.
Cheap and does the job.
http://www.ebay.com.au/itm/Camperva..._Parts_Accessories&hash=item5660851419&_uhb=1