I pulled a Colorado 4wd with a Harley Davidson in the back on a 337XL for 4 years.
Check the weight on your Colorado, if it is a 2015+ you will likely find that the dry weight is about 4475# , maybe about 4700# on an extended cab. The pre 2015 models are about 1000# less.
As far as how much your coach will safely tow you have to get the GCWR (gross combined weight rating) from the weight chart in your unit. It is likely 26000#. Subtract the accurate weight of your loaded RV from the GCWR and that will give you your tow capacity.
It is best to load the truck and run it across scales at a truck stop or farm supply store to get an accurate weight.
Also the previous post is correct. If you find your RV can tow the truck, look at the hitch capacity on your unit, it is likely rated at 5000#.
I installed a class 4 hitch with a rating of 8000 pounds as my bike and truck are over 5000# It is not difficult to do.
It is a similar hitch with heavier metal and larger bolts.
I have run my loaded RV and tow vehicle across scales and I am 200# under the GCWR, so you had better check it out closely as you will be likely be very close.
Good luck, the trouble and expense is worth it to take the toys along.
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