Car seat base not level?

Tina

We have the Chicco keyfit travel system. I installed the base in our Honda no problem, everything was level. When I tried to install in our Nissan, there’s no way to get the base level (adjusting the level of the base makes it worse, we need to adjust it to the other direction but there’s no way to do so). Does anyone have a solution? -I’ve heard you could roll up a towel or pool noodle to raise the front of the base, but I’m not sure how safe this is and I can’t find anything about it on the Nissan or Chicco manuals.

We drive a 2011 Nissan Versa and I don’t have want to get a new carseat just for this car since we were planning to trade it in a year or 2.

UPDATE: My husband was able to level it out by using all of his weight to push it down towards the back, then tightening the latch straps. The back of the base is digging into the seats, but it’s level! I’m going to take it to the fire station to make sure it’s safe.