1 - Merge the BAMs together with NGS: SAMtools > Merge BAM Files
2 - Load the BAMs as tracks at UCSC, then group them together into a track hub. See the help at UCSC for how to do this. If you have trouble, UCSC support can help with the specifics through though their google group. http://genome.ucsc.edu >> http://genome.ucsc.edu/goldenPath/help/hgTrackHubHelp.html
3 - Consider viewing the data within Galaxy's visualization tool Trackster. Dataset tracks can be dragged into groups and external tracks can be loaded into Galaxy and viewed along with Galaxy natively generated data.
Hope this helps!