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Fred Crimson's U.S. Military Wheeled Vehicles has one paragraph on page 347 about the XM778. It was built by White as a potential replacement for the "Reo" (M44) 2.5 ton trucks and tested at Yuma Proving Grounds in 1967 as part of a "Quality Assurance Test". The truck is described as having a strong resemblance to the M35 except for super single tires, outboard brakes, and louvers in the side of the tilting hood. The photo in U.S. Military Wheeled Vehicles looks very much like a M35, but it clearly has a tilting hood. You can't see the axles and there isn't much more in the description to identify features of the XM778. I have to wonder if there are more than one version of the XM778 or if your hood/front clip was modified since yours does not seem to have a tilting hood.
Based on the descriptions of other trucks that were looked at over the years to replace the M44 series I'll offer good news and bad news. The good news is you seem to have a very unique truck. I see no evidence to say for certain it's the only one, but I'd wager there aren't more than a couple out there. The bad news is I'd also wager a manual does not exist, or at the very least will be extremely difficult to locate.
Based on the descriptions of other trucks that were looked at over the years to replace the M44 series I'll offer good news and bad news. The good news is you seem to have a very unique truck. I see no evidence to say for certain it's the only one, but I'd wager there aren't more than a couple out there. The bad news is I'd also wager a manual does not exist, or at the very least will be extremely difficult to locate.