Ugg, I feel for you - it sounds like today was a challenge. As you know, roasters are very top heavy, so I have one word for you - flat-strap. When I went to pick up my YM-15, I took several come-alongs with me and secured the roaster by hooking the roasters steel frame from the front and back, and I also took two more come-alongs and pulled the steel cable on either side of the roaster, passed a 20ft flat nylon strap under the trailer, under the steel cable, over the roaster, back under the steel cable, and sinched it down so the only way that roaster was tiping over, is if the trailer did. And one time I took a curve a bit too fast, and my blood ran cold because I thought I saw it tip a bit.
Good luck getting to sunny Florida - we'll be cheering you on here. If you are coming through Alabama and run into any trouble, PM me - I'm in town this weekend.
Woody