TrakPower has a true hard case saddle pack setup.
Doesn't show up on ROARs' approval list yet. But their regular 4900 pack, and the 5400 pack they make for CheckPoint does, should just be a matter of time for ROAR to process the 4800 saddle testing, same construction it appears.
There are no Maxamps on the approved list, at least not yet.
http://www.roarracing.org/approvals/lipobattery.php