Rhino-Rack · New
Rhino-Rack 10-20 Toyota 4Runner 3 Base Backbone Mounting System
MPN RT4B1 · Store SKU rhrRT4B1
Supplier stock checked 11/7/2026, 8:20:45 AM UTC. Adding a part does not reserve it.
Request a return within 30 calendar days after delivery. New parts must be unopened and unused.
Shipping & returns ↗This policy does not limit rights required by law.Free standard shipping on eligible parts orders of $100 or more. Oversized and freight items excluded. Fitment, taxes, availability and final totals are confirmed before payment.
Product details
The Rhino-Rack Backbone is a mounting system for your Toyota 4Runner. Connecting to your vehicle's roof via 3 bases on each side, it allows for a Rhino-Rack Pioneer System to be fitted on top. Backbone Roof Rack System
Manufacturer fitment & guides
Check RT4B1 against the manufacturer’s application information below.
Part-specific notes
- California Proposition 65: Y