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Old 11-02-2016, 06:56 AM   #1
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Pinbox vs fiberglass

Our 2013 fifth wheel 3400RL has 1 1/2 inches clearance between pin box and fiberglass body. Since new the body has always flexed independent of the pin box when driving. On rough roads now the body almost touches the pin box when encountering a dip. I have inspected all roof areas, fiberglass siding, interior including thorough inspection of front area in closet and see no cracks or movement of any kind. Is this normal? Any similar movement in your trailers?
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Old 11-02-2016, 07:08 AM   #2
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My cap in relationship to the pin box moves about 1/2" at most. You might drop part of the skirting around the pinbox under the bedroom and look for broken welds in the steel framework.
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Old 11-02-2016, 11:41 AM   #3
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I would tell you to glue a wooden matchstick to the pinbox standing up under the fiberglass and would make its length one half inch shorter than the distance between the front cap and box. This way, if there is more than the half inch...the matchstick, being really soft wood, will break. This takes all subjective eyeball error out of the picture. Hope your eyeball is wrong. John
2012 F350 6.7 L dually, 2013 3800RE with 6 pt leveling, Sumitomo 17.5" load range h tires, Samsung 18 cu ft residential fridge, 8k Morryde I.S. with disc brakes. Full timing since 2012.
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Old 11-02-2016, 12:36 PM   #4
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I don't think it's normal to have that much travel in the pin box
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Old 11-02-2016, 12:40 PM   #5
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quote:Originally posted by K0LCB

I don't think it's normal to have that much travel in the pin box
What's normal?
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Old 11-02-2016, 06:27 PM   #6
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This past May, I discovered severe frame flex on the driver's side of our rig. I managed to locate a mobile RV repair guy who is also a certified welder who came to the campground we were at, and in addition to repairing the frame forward of the driver's side propane tank, he also discovered numerous cracks in the frame where the pin box is attached, which he spent close to an hour just grinding the cracks and welding the frame there. The pin box had not quite touched the fiberglass, but it had been close. Since the repair, it is as the trailer was when new. If you are having that much movement in your pin box, I would definitely recommend having the frame inspected and repaired, because it will not get better on it's own.

Bob & Becky
2012 3402RL
2012 Chevy 2500HD D/A CC 4WD
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