Ballast Weight

/ Weight #2  
Depends on whether R1, R3 or R4 type tires and what you're putting in the tires. If it's R4's, it should probably be 800 - 1,000 lbs for both tires. R1 will be less, R3's probably more. Shop manual should have a chart with specs for the L3800 or a call to a dealer should narrow it down.
 
/ Weight #3  
Yep there's a chart the tire shop has that lists tire size vs. ballast weight. Also the tractor manual may list it. I know my L3830 manual does.
 

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