Just an observation on my part but ...
Below a certain length of trailer it's just not mathematically possible to include both a dinette and a sofa - there's just not enough space for both. A few manufacturers have tried to address this issue by offering a Murphy bed in place of a conventional queen bed but that in turn minimizes the size of any pass through storage compartment below the bed - a poor solution IMO. That by definition means this becomes an "either / or" choice because you're simply not going to get both in a 20' trailer. With that in mind we ourselves decided that between the two - dinette or sofa - we'd get far more practical use out of the latter so we limited our search to 20 footers with a sofa. To our chagrin we found those floorplans to be in the minority, with most having a dinette instead.
😞 A further aggravation was that many of those with a dinette had that dinette mounted on an elevated platform because of the type of slide mechanism being used rather than being flush mounted to the trailer's main floor, making us feel like mannequins in a storefront window while seated at the table. :M It took awhile but eventually we found our current Coachmen Freedom Express 192RBS which offers a GIANT front pass through storage compartment and a sofa slide where we can relax with our feet on the main floor and if not outside eat a meal using lightweight portable TV tables. This will be our 5th season with this trailer, we haven't regretted not having a dinette table, and would recommend this approach to anyone looking at this size of trailer - IF they can find one they like, which can be a difficult task as so many manufacturers still haven't figured out that in this size of trailer a sofa is more useful for many than a dinette. :R
2012 Silverado 1500 Crew Cab2014 Coachmen Freedom Express 192RBS2003 Fleetwood Yuma * 2008 K-Z Spree 240BH-LX
2007 TrailCruiser C21RBH * 2000 Fleetwood Santa Fe
1998 Jayco 10UD * 1969 Coleman CT380