Based on our search for a 30'- 32' range 5th wheel last year, there will be extremely few choices in a 28' 5er. If you do find one, it will be an entry level unit and far from quality.
We had to jump up to 34' to 36' range to get away from the entry level units with tiny appliances and holding tanks. Our 2010 30' Wildcat was the perfect size for our type and style of camping. Nothing even close to it's build quality, cabinetry, appliances or holding tank size available last year in anything under 34'. (At least not in the east of the US.) I certainly wish a manufacturer would bring back a higher appointed 5er in the 30' range.
2019 Montana HC 310RE
2010 Wildcat 29RLBS
2014 Ford F-350 Lariat 6.7