I've also wanted to reinforce my fresh tank mount, but haven't done it yet. I've towed mine 160 miles with a full tank with no problems when I camped at Virginia International Raceway. Most of the trip is on smooth pavement, but the last mile or so is on a gravel, washboard, one lane road in the middle of the track to the camping area. No issues so far. I always open the fresh tank drain as I leave the track.
2013 Silverado 2500HD LTZ CC 6.6L Duramax Diesel
2014 Sunset Trail SF270BH
Holly & Buster, mini Dachshunds
2016: 1 trip, 3 nights in 1 state, 316 miles
2015: 5 trips, 18 nights in 3 states, 2707 miles
2014: 5 trips, 14 nights in 3 states, 2426 miles