Husky 353 is a very good mid range pro saw. It should last the average camper a lifetime if looked after! If the price is right (in fact the price is a steal if the saw is in good cond!) & the saw is in good condition, I'd buy it for sure.
Husky 350 is a nice saw, but entirely different to a 353.
Gen "3" Husky saws have been superseded, the update of the 350 is the 450.
The updated 353 is an awesome saw, the 550XP.
A quick google of the Husqvana website should clarify the differences.