This was actually a challenging scenario for someone who has 700+ hours in ETS2 and ATS combined (bragging here, sorry). I whacked it into 1st to transverse inclines and then into 5th or 6th going down the range as to not over rev the engine, driving about 5mph to keep the load steady on the flatbed over the uneven terrain. You really need that diff lock i'll tell ya!
I really expected to loose air pressure descending the mountain because I was riding the breaks all the way down but Beamng mustn't simulate air breaks yet, nor have I seen an air gauge in the cab of the T-Series. Can I make a suggestion? When approaching the final marker on the docks, can you add a few more in the docks to keep on track and one more marker just before you turn right to go down the dirt ramp? I nearly got lost lol.
Anyway I give this a 5/5 because:
1: Its nearly identical to the stock scenarios that ship with Beamng
2: It feels the way a stock scenario should feel, fluid and fun