Do you need three squads of Long Fangs? Are your three squads of
TWC differently armed for wound shenanigans? JotTW.
Obviously making friends through Warhammer is something that you don't care about
You don't NEED three squads of
LF, two can still fire at four targets. Rhinos are good because they add so much mobility and survivability to your men. I don't know too too much about
SW (mostly because I hate their lore, attitude, Leman Russ, and what happened to my beloved Thousand Sons) but if you have your 5 man squads and Rune Priests you can disembark and be gay with cover and still have extra some heavy weapon shots from the Razorback. Or atleast that's what the cool kids do.