just remember that the 5300lbs. number is with only a 150lb. driver in the Explorer, nothing else.
so, any passengers and cargo and WDH, will lower that 5300 number by its weight.
so, since your trailer weighs 4800lbs. loaded, that gives you only 500lbs. to account for passengers, cargo and WDH. if Mom weighs 150 and Dad and kids total 400 and cargo is 50 and WDH is 100, then you'll be over your max by 50lbs.
and that's to be just maxed out! nearly everyone on every RV forum i've been on, usually recommends being only at 80% of max, not at 100% of max.
by the way, i owned a 4.0 v-6 Exploder and would never tow a TT of that size with it.
and Zoe the Wonder Dog(R.I.P.)
'07 Roo 23SS pushing an '07 Chevy Avalanche
Equalizer WDH and Prodigy BC