# NHTSA Engineering Analysis EA86009
> **OVERLOAD** · Opened 1986-03-10 · Closed 1987-10-01
## Investigation
- **Action number:** EA86009
- **Type:** Engineering Analysis
- **Open date:** 1986-03-10
- **Close date:** 1987-10-01
- **Manufacturer:** Tiffin Motorhomes, Inc.
- **Affected makes:** TIFFIN
- **Affected components:** SUSPENSION
- **Affected model years:** 1986
- **Affected (make, year) variants:** 1
## Summary

SUMMARY OF INFORMATION FROM MANUFACTURER:TIFFIN USES THE CHEVROLETASTRO MINI VAN FOR 21 FOOT MICRO-MINI ALLEGRO MOTORHOME.TIFFINREPLACES THE REAR AXLE OF THE STOCK ASTRO WITH A CHEVROLET C-10LIGHT TRUCK REAR AXLE ASSEMBLY TO INCREASE ITS WEIGHT RATING TO7,000 POUNDS. (ASTRO HAS A 5,600 POUND GVWR).ANALYSIS:THE ALLEGRO IS FABRICATED WITHOUT DURABILITY OR COMPLETEBRAKE TESTING.TIFFIN LOADS A STACK OF 4'X8' PLYWOOD SHEETS ON THEALLEGRO CHASSIS REAR FRAME RAILS FOR A FEW HOURS TO CHECK FOR SAG.IF NO PERMANENT SET IS FOUND THE VEHICLE IS DEEMED SATISFACTORY AT7,000 POUNDS GVWR.STATUS:CLOSING MEMO TO (H) 9/9/87.===

## Source
- [NHTSA ODI investigation page](https://www-odi.nhtsa.dot.gov/owners/SearchResults?searchType=ID&targetCategory=I&searchCriteria.nhtsa_ids=EA86009)
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