BizMom0f4

I have never posted to a board like this, however my 2016 GMC Yukon XL has been shaking to the point of scary every time I get over 75mph on the hwy. My kids even get scared when we are driving to the cottage, its even worse if we are pulling a snowmobile trailer or jet-ski. I am wondering if anyone can tell me what if anything fixed the issue so I am not paying for multiple different things if it is only 1 issue. My truck has less than 100K miles and should not be shaking like this, it gets so bad over 77 mph that I must grip my steering wheel differently because my wrist will hurt. Basically I have resorted to driving under 75mph which is not always easy when the speed limit is 70 and many are going 85 in my area.