Equipment consists of usable grenades and tools, the majority of which are single use. You can carry up to four such items, at most two each from the Lethal and Tactical categories.
The first Lethal or Tactical you equip consumes one of your class creation points, but the second takes two, so only double up if you’re going to get maximum use out of carrying an extra item...
The Warfighter Rig’s trait Resupply comes in handy for any equipment-focused build, giving you the ability to resupply your Lethals and Tacticals from enemies killed with non-explosive weaponry.
Likewise, the Stryker Rig’s traits and Centurion super are all useful for an equipment-focused class.
When you’re fighting against heavy enemy equipment usage—particularly in objective modes as an objective focused player—.the Engineer, Blast Shield, and Tac Resist perks are all useful.