The original tire grip sheet has not been updated to include DMHS tires, but according to dataminer u/WildRider07 they are equivalent to MHS I.

If you need to transport more than one set of logs, use the exploit of manual loading more logs (3 logs are one set) into the trailer and transporting them without packing. Switching zones works with that method. When delivering, unload until only 3 logs remain on the trailer, pack, deliver, load 3 more, repeat.

List of attachments by vehicle:

As of today [06.01.2024], there seems to be no practical way to transport more agricultural equipment at one time. Just plain ol' trucking.

-Trailers: Wika rip (https://spintires.fandom.com/wiki/Trailers)

-Cargo: Post by u/norwal42 (https://www.reddit.com/r/snowrunner/comments/liq8c2/snowrunner_cargo_icons_and_sizes_updated_phase_3/)

-Tires grip: Post by u/TTFH3500
(https://www.reddit.com/r/snowrunner/comments/hwnuco/differences_between_the_tire_types_trailers/)

-Tires grip DMHS: Post by u/WildRider07
(https://www.reddit.com/r/snowrunner/comments/y2wg79/season_8_is_already_out_and_i_decided_to_check/)

-List of trucks with logging related add-ons: Post by u/Shadow_Lunatale
(https://www.reddit.com/r/snowrunner/comments/lkqkyp/stop_logging_time_list_of_trucks_with_logging/)

-Tractor Coupler: wika rip
(https://spintires.fandom.com/wiki/Trailer_Couplers)

If any info is outdated or incorrect, please comment and I will try to update it... in a month or so :)