We have a 35 footer with three slides, and we tow a golf cart on a trailer - which we like to store on the site. You will certainly be able to fit in a Preferred. It's all about personal preference. Preferred are not our 1st choice for a number of reasons: it is not important to us to be close to the the Settlement, some of the sites are quite challenging to back into, the noise level can a bit higher than other locations (but the bus and boat noises are charming to some, ask of something away from the basketball hoop), some of the sites feel very "closed in" by brush and vines (and others love it for the privacy that affords). We go back and forth between Premium and Full-hookup, preferring the 1700 and 800 loops (believe it or not, some of the FH are the most spacious in the park). No matter where we have ended up, we've been happy and have only asked for a site assignment change once in all of our visits. I think we may be a little more choosy if we were doing a longer stay.
You may wish to do a search in the App store - plenty of FW site help there.