Remco's web page has an application chart, for equipment required for towing 4 down.
If the warrantee is voided, that is up to the vehicle manufacturer .
If Remco doesn't list the vehicle chances are it can't be towed.
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.