Steve,
Could be a number of reasons, but the potential weight may be the main consideration. Many of the smaller and "lite" trailers have limited space within the frame, and a larger "filled" tank would take away from the limited CCC thus leaving less weight for personal "stuff" (keeping under the GVWR).
Another thought comes to mind, depending on the location of a larger tank it might make it a challenge (when filled) to acquire the manufactures 10% to 15% loaded tongue weight requirement.
Just thinking out loud.
Bob
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2016 GM 2500HD 6.0L/4.10
2018 Jay Flight 24RBS
2002 GM 2500HD 6.0L/4:10 (retired)
2005 Jayco Eagle 278FBS (retired)
1999 Jayco Eagle 246FB (retired)
Reese HP Dual Cam (Strait-Line)
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