Apex domains cannot have CNAME records.
Question and response
Question
dig 1bigtrucktrader.com. NS
Answer
1bigtrucktrader.com. 5 NS ns-443.awsdns-55.com.
1bigtrucktrader.com. 5 NS ns-896.awsdns-48.net.
1bigtrucktrader.com. 5 NS ns-740.awsdns-28.net.
1bigtrucktrader.com. 5 NS ns-1650.awsdns-14.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0