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My 5th Wheel is 36 feet long and when attached to my extended cab long box truck, my overall length is 52 feet. I measured from the front bumper of my truck to where the king pin attachment point on my hitch and that is about 16 feet with my truck. Because the front of my trailer is pretty close to where the king pin is, I can just add the 36 feet to the 16 feet and it matches what I actually measured. I can't say for sure that you're GM truck would measure the same as my old Dodge, but I'm guessing it's close (depending on your cab configuration, of course).
I think it's pretty close. I found a website that lists the rear overhang as 52". So I'm guessing the 33' 5er is the same overall length when hooked up as the 29' bumper tow.
Here's why I am asking. We have narrowed our trailer search down to two bumper pulls:
Rockwood Ultra Lite 2608BS (29' 11")
SPECIFICATIONS
Hitch Weight: 796 lb.
UVW 6608 lb.
CCC 2188 lb.
Exterior Length: 29' 11"
Exterior Height: 11' 2"
Exterior Width: 96"
Fresh Water: 60.00 gal.
Gray Water: 90.00 gal.
Black Water: 45.00 gal.
Awning Size: 21'
And the Heritage Glen 271RL (34' 5")
SPECIFICATIONS
Hitch Weight: 1070 lb.
UVW 7738 lb.
CCC 2132 lb.
Exterior Length: 34' 5"
Exterior Height: 11' 2"
Exterior Width: 96"
Fresh Water: 57.00 gal.
Gray Water: 48.00 gal.
Black Water: 30.00 gal.
Awning Size: 10' & 12'
We were leaning towards the 2608BS because of length. But we love the layout of the 271RL, but we would be 55 ft going down the road.
But then we found the 5er version of the 271RL, the Heritage Glen 290RL (33' 8")
SPECIFICATIONS
Hitch Weight: 1825 lb.
UVW 9919 lb.
CCC 2106 lb.
Exterior Length: 33' 8"
Exterior Height: 12' 7"
Exterior Width: 96"
Fresh Water: 57.00 gal.
Gray Water: 62.00 gal.
Black Water: 30.00 gal.
Awning Size: 15'
This would put our going down the road length at 49 ft and we get a lot more in the 5er version (larger shower, W/D hookup, way more storage). And the revelation came when I realized the 5er combo would be shorter than towing the 2608BS. Holy crap why go for the "shorter" 2608BS when we can get exactly what we want for the same overall length with the 5er?
So I jumped on here and asked the question. Glad I did. Now to find a 290RL around here to look at.
Tow vehicle is the 2015 2500HD 6.0 CC regular bed. I have weighed it and with both of us in the truck we have 2,600 lbs of CCC. So I think the 290RL is well within it's capabilities.