I am doing a wedding cake for my cousin this weekend, it's a 10"-8" double barrel (8" high)-6" cake supported with the SPS system (a 7" SPS plate secured with double sided carpet tape in between the double barrel tier which is iced in ganache).  The cake drum is 14" wide.  The cake will be fully chilled and I'm dressing warm and blasting the AC.  The thing is that the venue is 4 1/2 hours away and there are a lot of hills and windy roads.  I always deliver boxed and fully assembled but I'm worried this one may be too top heavy and tip over around a turn since it's so tall?  If it were straight roads I wouldn't be thinking twice but I'll be down in the hills of southern Ohio.  I hate assembling on site but I will do it if it's necessary.  Thanks in advance for any advice!

If it were me, I would assemble it at the venue.  Much easier to complete the assembly at the venue rather than try and repair a disaster!  Good luck!

Definitely assemble on-site. It will make for a much less stressful 4 1/2 hour ride.

I delivered a tall cake last weekend, 30' drive, fully assembled, properly supported... but there's only so much you can do. Mine arrived leaning to one side, and the best way to fix it was to shim the base. Next time I'll be assembling on site.

I'm a total SPS advocate, but I'd assemble this onsite.

For the sake of your sanity, stack on site!  Good luck :-)

Thank you all so much!  I will assemble on site (waaaahhhhhh!) lol

Yeah, if Leah is telling me to assemble onsite, onsite it is lol  I've referred to her SPS post roughly 1,000 times over the years lol