Guessing ~5,500 lb complete but no bed.
Guessing ~6,500 lb with a mostly wood framed grain bed. if different bed you'll have to estimate from there.

I'd recommend as a minimum an 18' double axle flat trailer rated about 10,000 lb, and a newer 3/4 or 1 ton pickup, preferably diesel.
If you find a model 3800, 4100 or 6100 then a 16' trailer should work.

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-