This is what I found here in a search, but the info is pretty old by now:

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There are TWO Guatemalan access points within 50km of Tapachula ,Chiapas; nearest is Talisman, CHIS (El Carmen ,GT) at the end of Mex 200 east of the big city .
Second , Cd Hidalgo ,CHIS ( Tecun Uman ,GT) is 25km south near the coast .Both have fine paved access routes . Both can be busy with truck traffic which may clutter your perception . Cd Hidalgo in particular can confuse you as there are two bridges with one at north being exclusively for commercial trucking and the old town center bridge is for" civilian" vehicles and pedestrians .
For BOTH these CROSSING TOWNS you need to do the MEXICAN exit-paperwork for you and the bike at HUIXTLA Customs Terminal which is about 70km NORTH of the border along the north side Mex 200 and almost 10km west of the junction of highway Mex 211. Get your papers in order there and then the Mexican exit at the border will be a breeze. The GT entry procedure is handled at each of the GT towns. Either crossing can be used for access to CA 2 which runs along the coastal plain and foothills all the way to El Salvador. There is also from Talisman the option of RN 1 which takes you directly into the mountains and to CA 1.

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Anybody gone through recently? Does this hold up or is there new stuff I need to know?

I also saw something about not being able to get a TIP for my motorcycle with cash, needing to do it with a bank transfer; is that true?

Thanks in advance if you know
Andy