First things first ... Welcome to the forum.
From your profile I see you have an Alpine 3650RL that has a load capacity of 2995lbs. ..... As long as you don't have too much other "Stuff" onboard you should be fine. I assume you will not be towing with the tub filled.
Not to be nosy but, what is the tub for? I am picturing an opportunity for some homemade wine.
If you can keep it as close to the axles as possible. Enjoy, Hank
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Hank & Lynn
2007 Cougar 290RKS, E-Z Flex, 16" XPS RIBs ( SOLD
.. Gonna miss her ... looking for new 5r)
2004.5 Dodge 2500 QC, LB, 5.9HO, WestTach gauges, Ride-Rite