The L3901 is a nice tractor, I had one for several years. You already have noticed, they are very light in the rear. For me, even with loaded tires, it was almost unusable unless I had a lot of rear ballast. I pretty much left my chipper or old heavy box scraper on at all times. Again, great little tractor, just be careful.
Thanks for the warning, it’s a great tractor, just need a lot to get it up, will be well worth it when it is completed.