there is a difference though, the black hawk is a budget brand and has budget features, like older tread designs that give decent life but wear faster than more advanced designs, the make up of the belting and rubber can be different affecting wear properties between them.  basically the tech is lower in the sailun groups budget tires.  

also another thing you have to look at is when we talk sailun tires on here we are talking about the commercial trailer tires, usually something like the S637 which is a 14 ply tire that you will normally have to change out the rims also to take advantage of the higher air pressure they run, 110PSI. 

the black hawk HST01 looks interesting but it is just a 10 ply (these are for the 16" tires on my 5th) I like how they state it is engineered to provide low rolling resistance, if that is true that's awesome, but I would like to see the resistance numbers published like they do with commercial tires.  instead of a "low tech" tires that Blackhawk usually is, this might be a stop gap because the sailun name doesn't make a 10 ply, or a 12ply tire for trailers (that I know of) so it may be a decent buy