Hey @greavette,
have you tried with something similar to this section from the guacamole howto
Setup the reverse proxy
vi /etc/httpd/conf.d/guacamole_reverse.conf
SSLProxyEngine on
# ProxyPass: guacamole
# Description:
ProxyPass /path/to/guacamole/ http://FQDN:8080/guacamole/ flushpackets=on
ProxyPassReverse /path/to/guacamole/ http://FQDN:8080/guacamole/
<Location />
SSLRequireSSL
</Location>
ProxyPass /path/to/guacamole/ ws://FQDN:8080/guacamole/websocket-tunnel
ProxyPassReverse /path/to/guacamole/ ws://FQDN:8080/guacamole/websocket-tunnel
<Location /websocket-tunnel>
</Location>
then
systemctl restart httpd.service
More info about proxying from guacamole website