The main differences between the EasyFold and the EasyFold XT are:

- The EasyFold XT accommodates bikes with tires up to 3 inches wide, while the EasyFold supports tires only up to 2.5 inches wide.
- The EasyFold XT has an integrated ramp that folds up, whereas the EasyFold has a removable ramp.
- The EasyFold XT includes wheels for easier movement of the carrier, which weighs about 50 lbs.
- The EasyFold XT is a newer, improved version of the original EasyFold with these enhanced features.

Regarding the EasyFold XT 3 specifically, compared to the EasyFold XT 2:

- The EasyFold XT 3 carries 3 bikes, while the XT 2 carries 2.
- The XT 3 is heavier (23.1 kg vs. 17.9 kg) and wider (83 cm vs. 63 cm).
- Both have a maximum load capacity of 60 kg and similar features like taillights and 13-pin connectors.
- The XT 3 offers a smart foot pedal with topple feature for easy boot access, which is not on the XT 2.

In summary, the EasyFold XT is an upgraded version of the EasyFold with better tire compatibility, integrated ramp, and wheels, and the XT 3 variant adds capacity for 3 bikes and some size and feature enhancements over the XT 2.