M1 Compatibility
The full-size Tune M1 fits the Chevy Silverado 1500. It fits the 5'8", 6'6", and 8' bed Silverado 1500 (1999–present). All standard Silverado bed lengths are supported.
The Silverado's payload story is similar to other full-size trucks: work trims offer generous headroom, luxury trims are tighter, and engine choice matters. The Duramax diesel option deserves specific attention since its heavier engine meaningfully reduces payload versus gas options.
Your payload number is on the sticker inside your driver's door jamb. See the payload guide for why the advertised number doesn't apply to your specific truck.
Cab + Bed: The Decision That Shapes Your Build
The Silverado 1500 sells in three cab sizes and three bed lengths. The combination matters more for how the truck lives day-to-day with the M1 mounted than for whether the camper fits.
Regular Cab + 8' Bed
Two-passenger fleet config — increasingly rare on dealer lots but plenty out there used. The Reg Cab WT with the 5.3L V8 has the highest payload of any Silverado you can buy. If you camp solo or as a couple and you can find one in good shape, it's the most M1-friendly Silverado config.
Double Cab + 6'6" Bed
Extended cab with conventional rear doors and a usable rear seat for kids or short adult trips. Comes only with the 6'6" bed. This is the all-rounder: real bed length for under-platform storage, decent payload margin, and not so big it becomes a chore in tight parking.
Crew Cab + 5'8" or 6'6" Bed
Full 4-door cab — the most common Silverado on the road. The bed choice is the real call:
- 5'8" Crew Cab: easier to park, but the M1 platform extends past the bed and you lose meaningful storage under the platform. Bed walls are short for stowing tall gear too.
- 6'6" Crew Cab: the best Silverado config for a full M1 build with a family. Adds about a foot to overall length, but you get a real bed for storage and a much better proportioned rig.
Quick decision frame
Solo / couple, max payload: Reg Cab + 8' (used) or Double Cab + 6'6". Family vehicle: Crew Cab + 6'6". The 5'8" Crew Cab works but is the most compromised bed for an M1 build.
Chevy Silverado 1500 Payload by Trim
Approximate community-sourced door sticker ranges for the 4th gen Silverado (2019+). Always verify your specific truck.
| Trim | Approx. Door Sticker Range | M1 Build Verdict | Notes |
|---|---|---|---|
| WT / Work Truck (gas) | ~1,700–2,200 lbs | ✓ Strong Margin | Lightest config, best payload. Great platform for M1 builds. |
| Custom / Custom Trail Boss | ~1,500–1,900 lbs | ✓ Workable | Solid everyday trim with good payload margin. |
| LT / RST | ~1,400–1,800 lbs | ✓ Workable | Mid-range trim. Good room for full build with planning. |
| LT Trail Boss | ~1,300–1,600 lbs | ⚠ Moderate | Off-road suspension and hardware adds weight. Model build carefully. |
| LTZ / High Country | ~1,100–1,500 lbs | ⚠ Tight | Heavier luxury trim. Leaves less margin; discipline required. |
| ZR2 | ~1,200–1,500 lbs | ⚠ Tight | Off-road performance hardware adds weight. Check sticker carefully. |
| Any trim + Duramax diesel | ~150–250 lbs less than gas equivalent | ⚠ Engine penalty | Diesel engine is heavier; reduces payload vs. gas equivalent. Check sticker. |
The Duramax Diesel Payload Trade-Off
The 3.0L Duramax inline-six diesel is popular for its fuel economy on long highway hauls, but it's a heavier engine than the 5.3L or 6.2L V8 options. The weight penalty reduces your available payload by roughly 150–250 lbs compared to an equivalent V8 trim.
If you're primarily using the Silverado for M1 camping and payload is a priority, the 5.3L V8 is worth considering over the Duramax. If you already own a Duramax Silverado, check your sticker and use the calculator, many Duramax owners run the M1 just fine, but the margin is tighter than equivalent V8 trucks.
Realistic Payload Budget: Silverado 1500 + M1
| Item | Weight | Notes |
|---|---|---|
| 100Ah LiFePO4 battery | ~26 lbs | Varies by brand |
| Mattress (4" foam) | ~18 lbs | Custom cut to platform size |
| 10 gal fresh water | 83 lbs | 8.34 lbs/gal |
| Camper gear & accessories | ~60 lbs | Estimate, varies widely |
| Driver | ~175 lbs | Use actual weight |
| Passenger | ~150 lbs | If applicable |
| Cab gear (bags, food, etc.) | ~30 lbs | Easy to underestimate |
| Full fuel tank (24 gal) | 151 lbs | 6.3 lbs/gal × 24 gal |
| Subtotal (everything except the M1) | ~693 lbs | What loads onto the truck before the camper |
| Tune M1 (base, full-size) | ~500 lbs | Dry weight, no gear (Tune spec) |
| Grand total (with M1) | ~1,193 lbs | What you're actually putting on the truck |
On a WT Silverado at 1,800 lbs, that's ~607 lbs of headroom — more room than you'll realistically use. On a Duramax LTZ at 1,100 lbs, you're 93 lbs over and need to lighten the load (smaller battery, less water, lighter gear). Use the calculator to find your exact number.
Silverado-Specific Tips
- WT and Custom trims are the sweet spot for payload-focused builds. They're lighter from the factory and offer the most M1 margin.
- Duramax owners: check your sticker. The diesel's weight penalty is real — 150–250 lbs less payload than a V8 equivalent. Many Duramax builds work fine, but don't assume.
- Regular Cab carries more than Crew Cab. The larger cab adds weight, which reduces your payload rating. If you're on the margin, cab config is worth factoring in.
- All three standard bed lengths work. The full-size M1 fits the 5'8", 6'6", and 8' Silverado 1500 (1999–present). Cab choice changes your payload; bed length doesn't change M1 fitment.