ISSUES WITH A NEWLY PURCHASED (USED) TRAVEL TRAILER

Sorry guys for taking so long to get back. I LUCKED OUT !! Found the hot water supply line was half screwed off and only other leak was the toilet valve that had previously been replaced because there was an older valve in a drawer. The person that replaced the valve appears to have cracked and tried fixing it with what appeared to be the old type brown looking Permatex Gasket Sealer. I purchased a new one and escaped redoing a bunch of leaks..Thanks for the help.