Since I try to stick with the truck being original and utilize existing styles of connectors...I usually snake plugs off 80s toyotas in the junkyard or buy new from the following fellas.
Eastern Beaver Japanese, USA and European made connectors for cars and motorcycles
www.easternbeaver.com
Motorsport electrical products: OEM and hard to find terminals and connector kits, wiring, harness supplies, tooling, and sensors for modern and vintage motorcycle, automotive applications. Easy online shopping, low cost shipping options, to expedited around the world. We accept Paypal and...
www.corsa-technic.com
We have Vintage and modern Sport-bike Motorcycle Wiring Harness electrical Connectors, These connectors are purchase directly from the manufacturer, And in many cases the OEM Supplier, The terminals and connectors are superior quality. Most are Manufactured in the, Japan, USA or Europe. Bullet...
www.cycleterminal.com
Then crimp on using the associated terminals.
If you're rewiring a lot, then yes there are much better like Deutsch that
@Delta VS mentioned or the new types from Sumitomo or Yazaki.