As 51's operating out of the goo - there is no reason to suspect it would be more difficult than a 109 or 190 (or F4U or P-40 or whatever in SWP back in Guadalcanal days before PSP). Simply we operated from PSP or concrete where possible and we weren't moving around as much as the Germans.
Good point. F4F landing gear was not exactly condusive to the early dirt field conditions at Guadalcanal (Ground loops were common) yet the plane was successfully operated out of it. The only plane i'm aware of that had genuine gear issues was the USN F2A's which was allegedly a quality control issue. Lots of recorded gear failures and repairs.