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Field Tools

OVERLANDER
TOOLKIT

Six precision calculators built for serious expedition travel. Size your rig, plan your provisions, rig your recovery — before the road disappears.

◈
Air Suspension
14,500 lbs
◉
Solar
1,350W
◆
Winch
13,500 lbs
⬡
Water
91 gal

Air Suspension & Tongue Weight

Calculate optimal PSI for each preset and verify tongue weight distribution.

Trailer Setup
8200 lbs
4000lbs16000lbs
75 %
40%100%
2250 lbs
1000lbs5000lbs

Tandem Axle (4 springs)

Air Suspension Bias — RREV ISA

Adjusting front vs. rear air spring pressure shifts the load distribution along the trailer chassis, directly changing tongue weight at the hitch.

50 %
0%100%
Tandem Axle (4 springs) · Bias: Equal
615 lbs
Tongue Weight
✓ 10% — ideal
10%
Tongue %
Of loaded weight
68 PSI
Front Spring(s)
Current bias setting
68 PSI
Rear Spring(s)
Current bias setting
Pressure Presets by Terrain
Camp / Loaded
68 / 68
F / R PSI
Freeway
78 / 78
F / R PSI
Off-Road
53 / 53
F / R PSI
Loaded Weight6,150lbs
Total Spring Capacity9,000lbs
Load Ratio68%
Front Spring Load (ea)1,538lbs
Rear Spring Load (ea)1,538lbs
✓Tongue weight 615 lbs (10%) is in the ideal 9–15% range. Bias: Equal.

RREV ISA suspension: 9,000 lbs/spring (single), 14,500 lbs (tandem), 17,000 lbs (triple). Bias adjustments made via the RREV HUB app — independent per-wheel BLE control. Pressures are estimates; always confirm with RREV HUB readouts.

◈ Methodology & Safety
📐 How PSI is calculated
Load ratio (loaded weight ÷ total spring capacity) is mapped to a 20–100 PSI range. Front/rear bias shifts load distribution along the chassis, changing effective tongue weight by ~1% per 10% bias offset.
⚖️ Tongue weight target
Industry standard is 9–15% of loaded trailer weight. Below 9% causes sway; above 15% overloads the tow vehicle rear axle and hitch receiver.
🔧 Bias adjustment safety
Never set any individual spring below 15 PSI — minimum pressure to maintain bead seal. Always adjust pressure with trailer on level ground and unhitched from tow vehicle first.
📱 RREV HUB app
RREV ISA suspension adjusts all four corners independently via BLE. Use the three saved presets (Freeway / Off-Road / Hitching) — do not manually adjust while moving.
⚠️ Triple axle note
Triple axle configs distribute load across 6 springs. Middle axle carries the highest load at neutral bias — monitor center spring pressure first when diagnosing uneven wear.
Field Notes
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The 70% Winch Rule

Never run your winch at full rated capacity. Work at 70% maximum to protect the motor, rope, and your recovery anchor.

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Air Down Before You're Stuck

Airing down on sand or loose terrain is easier before you're in trouble. Carry a quality compressor — recovery is faster than getting unstuck.

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Water Is Weight

Water weighs 8.34 lbs per gallon. A full 65-gallon tank is 542 lbs. Factor this into your payload calculation before loading other gear.

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Tongue Weight Kills

Too little tongue weight causes sway; too much overloads your tow vehicle's rear axle. Target 10–12% of loaded trailer weight.

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Plan Solar for Cloudy Days

Size your battery bank for 2 days of no-sun autonomy. Desert sun is great — Pacific Northwest or mountain valleys, not so much.

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Navy Showers Save Trips

A navy shower (wet, off, soap, rinse) uses 6L versus a normal shower's 60L. Master this and triple your off-grid water range.

Built For Your Mission

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Every RREV is engineered around the numbers that matter — the same ones these tools help you calculate.

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