I don't have a Toyota but I do tow a Fiat 500 Abarth. Let me tell you that thing has a low front end. Prior to this I had a Mazda 3 which is pretty similar to your Corolla. I have a Master Tow dolly (or is it Tow Master?) and the ends on the ramps are pretty thick, blunt. I found that keeping a couple of 2x6s handy and put them in front of the ramps to help get over that hump then to put a couple more on the ramps to help get up on the deck makes life easier. I also found it best to have a way to keep the boards from slipping out from under you as you drive up them. I use long screws, just be sure the boards are right side down, if you know what I mean.
2013 Coachman Mirada 29DSSE