I have a Tubus Tara/Cargo combo on my main touring bike. I am now building up an 89 model Univega mountain bike for touring. I have a Tubus Cargo rear rack and an old Blackburn lowrider front rack that I would like to use. I have four Ortleib Classic panniers that I want to use with this combo. But I have heard some stories about some being unable to use Ortleib panniers on the Blackburn low rider front rack. I have tried my pannier/lowrider rack and the panniers seem to ride ok. Is there anyone who has first hand experience using this combo? The lower portion of the upper hooks do not close as tight with the lowrider because of the extra metal but is it enough to work ok?