man..i had a u haul once with a trailer with a van on it....we to to a 5-6% long grade up near nm and it would not go more than 25mph up the hill....we ended up having to pull the fan off the trailer and drive up behind the uhaul...this was 15 yrs ago and im sure we were overloaded and then some....even with just the van back there...
i cant imagine that uhaul doing much with that truck and 5er on its tail....and if so, not for very long!
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