Fifth wheel pin box extension

The obvious answer would be added stress to the pinbox and frame that supports it. I would check with the manufacturer to see what they have to say about it.

Jerry

MFL wrote:
The obvious answer would be added stress to the pinbox and frame that supports it. I would check with the manufacturer to see what they have to say about it.

Jerry

Come ON give the guy a break! If it was OBVIOUS he would not have asked the question. These forums are to exchange information.

I do agree that checking with the manufacturer is the best place to start. Also if you need it for a short bed truck a sliding hitch also may help.

It looks less stressful then the reese sidewinder and yes I have short bed

You have not given the FW GVWR, or the current pin wt. Many lighter, and middle weight FWs come with an extended pin, to work better with 6.5 bed trucks. I'm thinking that Montana is fairly heavy, and an extended pin would not be recommended. JMO, still best to ask manufacturer.

Jerry

According to Keystone website it has a GVWR of 17K and a pin weight of 2945.

And I think it already comes from the factory with the extended (long pin box. So are you wanting to go even longer?

Is so a sliding hitch is probably a better choice.

Yes you are correct just measured the pin box, it must be long pin box, a ten inch extension would cause back of box to hit truck rail. I'm using Andersen ultimate 3220 hitch, pulled fine from Michigan to Georgia, but can't turn ninety degrees, don't want to wrestle with heavy slider.

Turning 90 seems to be over-rated. How often do you do it? If you can do it, that will put terrible stress on the rear axle and tires as they slide sideways.

Why????

My son has a forty one core as well, he says I'll need ninety to get into some camp grounds, so far i haven't needed ninety.

prk7 wrote:
Are there any drawbacks of adding a ten inch pin box extension to a montana 3791?

Agree with MFL for best answer to your question.

Just something for you to chew on.........My 1st RV was a new 1984 Aljo which was years before the industry gave us a sliding hitch. The unit came with a 30" extended pin box for short bed trucks and or a zero extension pin box for long bed trucks.
Well my truck had a long bed and the Aljo came with the 30" box which left the front of the 5er about 8"-10" from the back of the bed. The trailer pulled like a lead sled it was back to far from the trucks cab to be aero.
The RV dealer was looking for a 30" box for a customer with a short bed truck so I swapped.
You wouldn't believe how much easier the trailer pulled in heads winds and side winds.

Allworth wrote:
Turning 90 seems to be over-rated. How often do you do it? If you can do it, that will put terrible stress on the rear axle and tires as they slide sideways.

Why????

I really believe that those of us who can, DO!
Call me crazy but I turn 90 degrees quite often. I get in into non RV friendly fuel stations (less expensive fuel) and squeeze into spots I shouldn't be in. Turn 90 a lot in those situations. The last campground we visited, we were in a site that needed the 90 degree turning ability. This site put us right at the creek with beauty all around. "Worth it". To park the 5er here at home I also go a tad over 90. So yes, those of us who can, do!
I do remember when I had a manual slider with my old rig, I purposely avoided places I had turn 90 also.