Selection scope and sizing decision
Useful for: Recovery fleets sizing a rollback carrier for low-clearance cars, long-wheelbase vehicles or mixed light-vehicle transport
Low-clearance loading is a sequence of geometric transitions. The front overhang, wheelbase, breakover point, rear overhang and disabled condition can each control at a different point.
Deck geometry must be reviewed with the selected chassis and equipment. Ramps or articulated sections may improve one transition but introduce separate setup, rating and operating requirements.
Sizing inputs
Supply these values before a model, body size or working rating is selected:
- 01Representative target-vehicle wheelbases and overhangs
- 02Minimum ground-clearance and sensitive component locations
- 03Required usable deck length and width
- 04Published loading angle and deck transition geometry
- 05Winch, restraint and loading-surface requirements
- 06Selected chassis wheelbase, axle ratings and rear overhang
From sizing inputs to model approval
Size from the operating requirement, test the complete configuration and retain the project records that control the final selection.
- 01Define the target duty
Rollback wrecker deck geometry for low-clearance vehicle transport
- 02Quantify sizing inputs
Representative target-vehicle wheelbases and overhangs; Minimum ground-clearance and sensitive component locations
- 03Test the complete vehicle
Approach and Transition must both pass.
- 04Approve the selected rating
Target-vehicle geometry schedule; Manufacturer deck drawing and loading-angle conditions
Selection and sizing matrix
Use every row to test the proposed size. A nominal value is not sufficient when payload, geometry or operating limits conflict.
Scroll horizontally to view all columns.
| Decision factor | What to choose or check | Limit or condition |
|---|---|---|
| Approach | Check first contact between the target and the loading surface. | A headline angle may apply only to one deck or suspension condition. |
| Transition | Check clearance as each axle crosses the approach and deck hinge or breakover. | Passing the first ramp does not prove the complete path. |
| Deck fit | Confirm tire placement, overhang and securement access on the usable deck. | Overall deck length is not all usable load space. |
| Chassis integration | Recalculate completed mass, rear overhang and axle reactions. | A longer or lower deck can change chassis feasibility. |
Applied calculation
Check clearance at more than the first ramp contact A low approach angle does not guarantee that the vehicle clears the deck transition or final tire position.
- 01First contactRecord pass or conflict
Front overhang clearance at the approach - 02BreakoverRecord pass or conflict
Underbody clearance as the axles cross the transition - 03Deck positionRecord pass or conflict
Tire placement + overhang + restraint access ≤ usable deck
Decision: The controlling point is the smallest verified clearance or usable-space margin across the complete path, not the brochure angle by itself.
Evidence boundary: Illustrative decision sequence only. Use a controlled geometry study or witnessed loading check. This worksheet is not an operating instruction.
Selection evidence checklist
Ask for evidence that is traceable to the selected model, configuration, vehicle or project scope. A record from another project is context, not verification.
- Target-vehicle geometry schedule
- Manufacturer deck drawing and loading-angle conditions
- Completed-vehicle layout and axle-load calculation
- Controlled loading demonstration for the agreed target case
Selection and sizing traps
Comparing only the smallest published angle
Better selection method: Check every transition and the conditions attached to that figure.
Using overall deck length as usable length
Better selection method: Reserve tire, overhang and restraint working space.
Ignoring disabled suspension or tire condition
Better selection method: Include credible recovery states in the target schedule.
Limitations
- The page does not approve a loading operation or replace the carrier manual.
- Actual clearance depends on the target condition, surface and installed carrier geometry.
- Stop loading when clearance, restraint, deck rating, ground or winch conditions cannot be verified.
Evidence scope and technical basis
Each source is limited to what it can support. This makes the evidence chain readable to buyers, search engines and AI systems without turning a general source into a project claim.
Supports: Controls the project-input, quotation, approval and inspection workflow described in this guide.
Does not establish: It does not replace the signed quotation, approved specification, selected OEM documents or unit-linked project records.
Supports: Provides public checklists and worksheets; the signed project documents remain controlling.
Does not establish: It does not replace the signed quotation, approved specification, selected OEM documents or unit-linked project records.
Supports: Defines the relevant product family and published configuration boundaries. Project-specific ratings require the selected OEM documents.
Does not establish: It does not replace the signed quotation, approved specification, selected OEM documents or unit-linked project records.
Supports: Primary manufacturer example showing that towing-equipment ratings, chassis capacity and operating limits are manual and model specific. It does not provide a KEEYAK project rating.
Does not establish: It applies to the named manufacturer example and does not establish a KEEYAK model rating or project result.