About Matthew Underwood
M1 Builder is a free payload calculator built specifically for Tune M1 truck camper owners. I built it because payload is the #1 thing that matters when loading up a truck camper — and there was no tool that made it easy.
Pick your truck, add your gear from a community-verified weight database, set your water and passengers, and see exactly how much payload you have left in real time. No ads.
No signup required. Just honest numbers.
If M1 Builder helped you build a safer, better-loaded rig, buying me a coffee keeps the lights on. 🙌
Pick your truck, add your gear from a community-verified weight database, set your water and passengers, and see exactly how much payload you have left in real time. No ads.
No signup required. Just honest numbers.
If M1 Builder helped you build a safer, better-loaded rig, buying me a coffee keeps the lights on. 🙌
Recent supporters