I am trying to setup trunk between those two (ESXi 6.5 with HP 1820-48G) and nothing seems to work.
I have read vmware kb article (can not insert link) and no luck.
These are my setup options, brute forced them all and nothing is any good. I am either not getting connection or there are strange problems with connection out and resolving dns.
ESXi options:
Switch options:
Cant really do much debugging... is it even possible?
Unfortunately, your goal of adding bandwidth really won't work the way you expect.
See: VMware NIC Teaming - How to gain more than 1Gbit/s copy speed between two VMs?
If more bandwidth is required, you'll have to move to 10GbE networking.