I am only able to chime in based on my experience with my AIs. If you plan on transporting the TI fully assembled with Amas, then I would suggest the Dolly cart hands down. Even with my AI, I do not trust the weight on the scupper carts fully assembled. I will use the scupper cart for extreamily short distances (usually hull only & will walk the AMAS over) and placed pool noodled on the posts for cushy support. The Dolly is also much easier to place under the kayak than lifting and trying to get the scupper cart up and in there.
The only negatives Ive had with the Dolly are:
1. size- hard/cumbersome to carry with you on the kayak.
2. width. The beach where I launch at has a narrow entrance between the dunes, thus learned the hard way my first trip that the dolly won't work for me
Fitting various wheels on the carts isn't that difficult with a trip to the hardware store. I switch between wheeleez and hard tires all the time- I simply place a cut piece of PVC with washers when I place the hard wheels on the dolly/or scupper cart to reduce the size of the axels.