Which car hauler trailer to buy for my long bed?

[Scottcoda]

Greetings all, I am trying to figure out which one of these 2 trailers I should get, They are made by the same manufacturer (Rice) and are the same price ($3,495) The trailer will primarily used for my off road trail rig (99 jeep TJ) but may haul my 68 long bed gmc from time to time, so my main question is length, The dealer has a 18ft (16ft deck +2ft beaver tail) That has a tool box, and powder coated rims. The other trailer is a 20 ft (18ft deck +2ft beaver tail) no tool box and grey painted steel rims,
I like the looks of the powder coated rims and definitely would love to have a tool box for my straps but I would hate to buy the 18ft trailer wishing I had the extra 2 feet for my 207 inch truck (wheel base is 123inches)..Would my gmc even fit safely on the smaller trailer?? Thank you all in advance for your input and if you have any pics of your trucks on a car trailer please put them up with the trailer/truck info..