How to identify and eliminate bottlenecks in your caravan manufacturing flow

In caravan manufacturing, delivery time is rarely “the sum of every step”. It’s usually the sum of your wait times — vans waiting on parts, teams waiting on approvals, installers waiting on drawings, and QC waiting to get issues rectified.

That’s what a bottleneck really is: the constraint that sets the pace for everything else.

The good news? You don’t need a full factory overhaul to fix it. Most bottlenecks can be identified quickly with a few lean principles — then reduced (or removed) using simple, consistent visibility across production stages + inventory + purchasing + quality.

Here’s a practical playbook you can use today — built for the reality of Australian caravan factories (custom options, supplier volatility, and quality/warranty pressure).

What a bottleneck looks like (in the real world — caravan edition)

A bottleneck isn’t always one slow workstation. In caravans it often shows up as:

• Work piling up at one stage (e.g., fitout, electrical, plumbing, cabinetry) while other stages sit idle
  
• Trades constantly “chasing parts” (lights, hatches, fittings, appliances, water pumps, chargers, windows, seals)
  
• Issues discovered late at QC/PDI, causing rework to ripple backwards
  
• Vans getting re-prioritised daily because the schedule doesn’t match reality
  
• Purchasing expediting everything because lead times weren’t visible early enough
  
• Option changes (or unclear specs) creating “surprise rework” mid-build
  

If any of that feels familiar, you likely don’t have a “people problem”. You have a flow + visibility problem.

Step 1: Map the flow (fast) — then measure where it stalls

Lean thinking starts with one question:
Where does the work stop moving?

Do a quick pass of your process and capture:

• Stages (your real stages, not the idealised wall chart)
  
• WIP limits (how many vans should sit at each stage)
  
• Queue time vs touch time (time waiting vs time being worked on)
  
• Top reasons work stops (missing parts, rework, approvals, labour gaps, drawings/spec changes)
  

Even this basic view will reveal your constraint.

Quick win: if queue time is hard to measure, start with WIP Age by Stage — how long each van has been sitting at its current stage. Your bottleneck will announce itself.

Step 2: Find the constraint (and stop guessing)

Your constraint is the stage that’s:

• consistently overloaded
  
• hard to staff (scarce skills)
  
• dependent on scarce components
  
• highly variable (custom work, changeovers, rework)
  
• where issues are discovered last (which makes rework explode)
  

The trap: trying to speed up everything.
The fix: speed up the constraint first, because it controls throughput.

In caravans, your true bottleneck is often a mix of:

• fitout congestion
  
• materials readiness
  
• late rework discovery at QC
  
• supplier ETA blind spots
  

Step 3: Use lean strategies that actually stick (without chaos)

A) Reduce variation before you add speed

If the bottleneck is unstable (changeovers, rework, missing parts), pushing more vans into it makes it worse.

Do this first:

• standardise work steps and stage-gate checklists
  
• simplify option pathways where possible
  
• reduce “special” jobs that break flow
  
• don’t release work without materials ready
  

B) Create a pull system (not a push system)

Push systems create piles of WIP that hide problems.

A simple pull method:

• set WIP limits per stage
  
• release new work only when the next stage can accept it
  
• prioritise based on due date + constraint capacity (not who shouts loudest)
  

C) Fix upstream blockers that starve the constraint

Common caravan blockers:

• parts not kitted (or substituted without sign-off)
  
• drawings/spec changes not controlled
  
• approvals living in email/text threads
  
• defects discovered late at QC/PDI
  
• appliances/electrics arriving out of sequence
  

Step 4: Add digital visibility where it matters most

You don’t need “more software”. You need shared truth: what’s happening, what’s next, and what’s at risk.

Here’s how ProdPRO supports bottleneck elimination in a practical way:

1) Scheduler & Overview (bottleneck visibility)

When your schedule is visible and updated, bottlenecks stop being a surprise:

• see WIP across stages at a glance
  
• spot queues building early
  
• resequence jobs before you lose days
  
• identify the true constraint by stage load + WIP age
  

Practical tip: track the age of vans sitting at each stage. Your bottleneck becomes obvious.

2) Stock + BOM / Inventory (stop starving the line)

Nothing creates artificial bottlenecks faster than missing parts:

• link each job to its BOM/options
  
• see shortages before the van hits the floor
  
• kit earlier and reduce “hunt time”
  
• prevent starting work that will stall halfway through
  

Rule: don’t release work unless parts are ready (or you’re intentionally managing that risk).

3) Purchasing (real lead times, fewer expedites)

If purchasing runs blind, production will always be reactive:

• track supplier lead times (actual vs expected)
  
• trigger reorders at the right point
  
• stop expediting everything
  
• align purchasing priorities to the build plan
  

Key move: put supplier ETAs in the same view as the production schedule.

4) Communication & Collaboration (kill waiting time)

Many bottlenecks aren’t physical — they’re decision delays:

• automated alerts when a stage is blocked or due dates are at risk
  
• internal notes attached to the van/job (not lost in emails)
  
• fewer walk-arounds, fewer “who owns this?” moments
  

Outcome: faster decisions, less waiting.

Mini-case: A caravan builder cuts lead time by ~15% (schedule + materials sync)

A mid-sized Australian caravan manufacturer had a familiar issue: vans were being started without parts fully ready, and the floor was re-prioritising daily to “stay busy”.

What they did (simple, not magical):

• implemented a live scheduler so everyone worked from the same plan
  
• connected BOM/stock checks to scheduled vans
  
• introduced a “materials ready” rule before releasing work
  
• used alerts to flag shortages and stage blocks early
  

Result: within weeks they reduced stoppages caused by missing parts, smoothed WIP flow, and cut average lead time by ~15% — without adding overtime.

(You can keep “ACME Co” if you prefer — I just made it “a caravan builder” to feel more real.)

“Did you know?” KPI tip — track these to find bottlenecks fast

If you only track three numbers weekly, make it these:

1. Throughput (vans completed per week)
   Your truth metric. If throughput isn’t improving, your bottleneck hasn’t moved.
   
2. Rework rate (% of vans needing fixes at QC/PDI)
   Rework steals capacity from your constraint and creates queues everywhere.
   
3. Days blocked per van (and top block reasons)
   This reveals whether your bottleneck is “work speed” or “waiting time”.
   

Bonus: pair these with WIP Age by Stage to pinpoint the true constraint.

Practical next steps (start tomorrow)

If you want a clean plan:

1. list your real stages and capture WIP age
   
2. find the constraint (where queues build)
   
3. set WIP limits and stop releasing vans without parts
   
4. sync scheduling with stock + purchasing lead times
   
5. add alerts so problems show up early — not at delivery time