I might get told off here for ‘indirectly advertising’… but this could really help some people.
We run several hosting services, all using DA of course, and also have an SSL certificates site. All certificates offered are very cheap single root GeoTrust and RapidSSL and compatible with DA , issued instantly with no paperwork. DA users confused about how to create their CSR and install the certificate are welcome to use the live help as the support staff can help you with this … even do it for you if needed as long as it is for Direct Admin only.
See my signature for more info, free 30 day trial certificates are available.
Chained Root certificates are "old technology" and utilised by providers who do not own their own Root certificate. It is easier to install a Single Root certificate and single root certificates are generally regarded as being more trustworthy than a Chained Root certificate.
We(providing both types) recommend the use of a Single Root certificate unless the customer has a specific use for a Chained Root certificate.