IF that 'hot water tank' is a conventional rv water heater (suburban/atwood) then you drain it by removing drain plug and open a faucet hotside to allow air in
Drain plug is in outside compartment under burner tube.
Suburban drain plug will also be an anode rod so you unscrew it and remove the whole assembly
Atwood would have a Nylon drain plug only
Course who knows what previous owners have done ....modifications made???
Can't help on front springs
Is it time for your medication or mine?
2007 DODGE 3500 QC SRW 5.9L CTD In-Bed 'quiet gen'
2007 HitchHiker II 32.5 UKTG 2000W Xantex Inverter
US NAVY------USS Decatur DDG31