I have both the Q20 and the x5. Now let me preface this by saying that I am very new to Fifth Wheels, as in been on one trip new. I initially had a lot of trouble getting the x5 to lock into the Curt flip over ball goose neck hitch, but was finally able to get it to lock with a lot of effort. The Q20 has worked well thus far, although it seems a bit noisy to me. (I have zero experience with any others to compare the noise level to though). I too have not used the slide feature as of yet. My real fear is ever trying to take the setup out. I have a feeling x5 will be mean to remove. Oh yeah, if you have a bed line, forget using the x5, that was the first thing their tech line guy asked me about.
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