If you only use the CB on the trails or occasionally to find out why traffic on the highway isn't moving there's no reason IMHO to get a big, fancy, expensive CB. And zero reason for SSB or an (illegal) linear amplifier. If you can't hear your other trail riders there's no point in putting out tons of power, and most people don't run SSB or linears. And a big fancy radio is more likely to attract thieves.
I have the Uniden Pro 520XL, very similar to the 510XL posted above, and mounted in the same location (but just screwed directly to the windshield header trim). I've had it 5 years and it works great; I can hear and understand everyone in my group and everyone can hear me, even groups 20+ rigs long winding through dense tree cover. I like that it's small, unobtrusive, cheap ($40) and works well. You can even have it tuned and peaked for a bit more output power and receive sensitivity, though I've never felt it necessary to get that done.
Once you get a quality radio (not a handheld, and the 75WXST is essentially a corded handheld) the most important things are a good antenna and quality installation. The antenna should be mounted as high as reasonably possible and well grounded (using a braided ground strap if not mounted to the chassis). Use good quality coax and cut-off -- not loop or wrap -- any excess then put on a new connector if needed, and make sure there's no pinches or tight bends in the coax. Make sure the antenna-side of the coax is sealed so moisture can't get in, as that will affect the SWR.
I also have a 2m/70cm handy-talkie that I use on the road when I feel like chatting. Amateur radio is much more civilized than CB, with much better range (at least if you're running legally). But this isn't generally useful on the trails unless there's other hams in the group.
I'm a JKO Reject