Just a guess here. But I'll throw in my .02 worth.
I quit racing ATVs this year. But last year, we had several races in the Hickory and Morganton area. Never drove past exit 105 in Morganton. But on the way home, the bridge over the river just east of exit 138 was quite a hit. But we never hit one so hard that we had problems.
2015 F350 6.7L Lariat CC LB
2016 Vengeance Touring Edition 40D12
Former Forest River Campers:
2004 Puma 30FQSS
2010 Sabre 31QBDS
2014 Work & Play 30WRS