Specifications

Appendix F – Towing
The GCWR (Gross Combination Weight Rating) includes weight of both the motorhome and
anything being towed.
Only the V8 and diesel models are shown here. The combination of engine and rear axle ratios
are the determining factor for the GCWR on the P Chassis.
GCWR 10,000 10,500 11,000 11,500 12,000 12,500 13,500 14,000 14,500 15,000 16,000 19,000
ENGINES REAR AXLE RATIOS
5.7L (350)
V8 GAS
3.08 3.23 3.42 3.73 4.10 4.56
6.2L V8
DIESEL
3.42 3.73 4.10 4.56 5.13*
7.4L (454)
V8 GAS
3.21 3.42 3.73 4.10 4.56
4.88*
*Motorhome chassis only.
NOTE:
GCWR for unit with 4L80E transmission is 21,000# with GVWR of 16,500#.
For GVWRs less than 16,000#, the maximum GCWR is 19,000#.
Max GCWR with the 475 transmission is 19,000# for all GVWRs (1990 & before).
CAUTION: Adequate size brakes are required on towed vehicle/trailers over 1,000 of loaded
weight.
If our 11,800 lb. GVWR example motorhome is equipped with a 454 and a 4.88 rear axle, we
should be able to safely tow something that is up to 7,200 lbs. WOW! Of course, we would
equip it with remote brakes because those hills seem to get higher as both the motorhome
and we age. Also, the law in some states says you need remote brakes on anything over 1,000
lbs. Installing a hitch rated at 10,000 lbs just says the hitch is safe at that towed weight. Not
necessarily the motorhome. Be safe.
http://users.sisna.com/cebula/P-Chassis-AlignmentProcess.pdf 29 Version 0.7 –Sep 14, 2005