I have a 2012 F250 super duty diesel. Ive installed 4 leaf with overload and 100 pd airbags. I’ve been towing a 40’ grand junction 37qsl. Im trading up to a Jayco Seismic 3512 toy hauler. It has around 940 pd’s of tongue weight difference.

Any thoughts from anyone.

 

Moved to appropriate forum

 

My thoughts are that you are way over payload with the old smaller and lighter trailer on your F-250 diesel and the new one will be even that much more over. But that's just my armchair thoughts, you are the one with the rig, what are your scale numbers looking like compared to to your payload, axle and GVWR ratings?
F-250s with the PSD are heavy trucks with a lower (than F-350s) GVWR and payload, because of that they don't make for the best heavy fifth wheel tow rigs, better suited to conventional trailers.

 

Axles and tires.