From calculating axle loads to tracking the impact of accessories and passengers, OSCA provides a clear picture of your vehicle's weight distribution to help you stay within limits and maintain performance.
One Space. Countless Adventures.
Australia's Free Caravan & 4WD Community space Real Builds. Real Reviews. Real Results.
The smarter way to plan, build and travel. With a community that's been there before you.
2835 Members
Real people. Real setups. Real stories - and more joining every day.
Stop Guessing
Know your weights, your budget, and your limits - before you hit the road.
Make smarter decisions before you spend.
Plus, member-only discounts on gear, weighing services and more.
Everything You Need To Travel Smarter.
Towing Weight Calculator
Vehicle Management
Trailer Management
Easily track your trailer's weights and budget to ensure safe and stress-free towing. Manage features, accessories, and compliance with your vehicle's limits.
Buying Tools
OSCA is your ultimate buying companion, letting you match vehicles and trailers, compare weights, and track budgets in real-time. Easily budget for accessories like tow bars or roof racks, save photos of potential options and make informed decisions to find your perfect setup — all from the palm of your hand.
Member Benefits
Discounted Weighting Services
Paid members unlock exclusive discounts with trusted mobile weighing providers across Australia. It’s the easiest way to get your setup weighed properly—without paying full price.
Discounted Towing Courses
First time towing? Nervous reversing? Paid members get access to discounted towing and driver education courses, so you can build your skills and hit the road with confidence.
Other Tools
Hub for Smarter Choices
Leverage the Hub, where users share their impressions and vehicle details, to make more confident purchasing decisions. OSCA helps you match vehicles and trailers, compare weights, track budgets in real-time, save photos of potential options, and easily budget for accessories like tow bars or roof racks — all from the palm of your hand.
Track Budgets
Plan smarter with our budget tracking tools — perfect for managing your spend across vehicles, upgrades, and gear.
Checklists
Your pre-trip companion, designed to make preparing for your adventures simple and stress-free. From towing safety to ensuring your caravan is road-ready, this convenient feature saves you time and effort, so you can focus on the journey ahead. Stay organised and travel with confidence — your next adventure starts here!
Brands We Work With.
Black Jack Trailer Jacks
Tag Towbars
Down Under Weighing
Get-A-Weigh
Your Tow Weight
Why Choose OSCA?
More than just a weight calculator
The only free platform - Tools that other charge $50/month for
Built by the community, for the community
Everything in one place - Weights, builds, reviews, checklists
About Us.
OSCA was born from a simple idea: exploring Australia, and beyond, should feel exciting and empowering, not confusing or overwhelming.
What began as a simple vehicle and caravan weight calculator has grown into a platform built for travellers and outdoor enthusiasts of all kinds. From weekend campers to full-time road trippers, OSCA exists to help people travel with confidence, clarity, and community.
Behind OSCA is a small, passionate team who genuinely live this lifestyle.
Some of us have spent years skiing across Europe. Others grew up on the slopes and developed lifelong passions for cars, motorbikes, and off-road adventure. Many of us regularly explore Australia’s natural landmarks with family and friends, from alpine regions to coastal regions and remote bush camps.
Several of our team are preparing for their own Big Lap in 2026. For us, OSCA isn’t just something we work on, it’s part of how we plan, travel, and experience the outdoors every day.
